Publications by Prof Thomas Hecht

PUBLICATIONS
Hecht, T. and Jones, C.L.W. 2009. Use of wild fish and other aquatic organisms as feed in aquaculture – a review of practices and implications in Africa and the Near East.

M.R. Hasan and M. Halwart (eds). Fish as feed inputs for aquaculture: practices, sustainability and implications. FAO Fisheries and Aquaculture Technical Paper No. 518. Rome, FAO. pp. 129–157.

Potts, W., Hecht, T. & Andrew, T.G. 2008. Does reservoir trophic status influence the feeding and growth of the sharptooth catfish, Clarias gariepinus (Teleostei: Clariidae)? African Journal of Aquatic Science, 33 (2): 149-156.

Weyl, O.L.F & Hecht, T. 1998. The biology of Tilapia rendalli and Orechromis mossambicus in a subtropical lake in Mozambique. S. Afr. J. Zool. 33: 178 – 188.

Hecht, T. & Uys, W. 1997. Effect of density on the feeding and aggressive behaviour in juvenile African catfish, Clarias gariepinus. S.Afr. J. Science 93: 537 – 541.

Ende, S.S.W. and Hecht, T. 2011. Ontogeny of the feeding apparatus of hatchery-reared white margined sole, Dagetichthys marginatus (Soleidae): implications for cultivation. Journal of Applied Ichthyology. 27:112-117.

Bernatzeder, A., Cowley,P.D., Hecht, T. 2010. Do juveniles of the estuarine-dependent dusky kob, Argyrosomus japonicus, exhibit optimum growth indices at reduced salinities? Estuarine, Coastal and Shelf Science. 90(3):111-115.

Kriwet, J. and Hecht, T. 2008. A review of early gadiform evolution and diversification: first record of a rattail fish skull (Gadiformes, Macrouridae) from the Eocene of Antarctica, with otoliths preserved in situ. Naturwissenschaften 95:899–907.

Grandcourt, E. M., Hecht, T., Booth, A. J., and Robinson, J. 2008. Retrospective stock assessment of the Emperor red snapper (Lutjanus sebae) on the Seychelles Bank between 1977 and 2006. – ICES Journal of Marine Science, 65: 889–898.

Bernatzeder, A., Cowley, P.D., Hecht, T. 2008. Effect of short term exposure to the anaesthetic 2-phenoxyethanol on plasma osmolality of juvenile dusky kob, Argyrosomus japonicus (Sciaenidae). J. Appl. Ichthyol. 33 (2): 149-156.

Jones, C.L.W., Kaiser, H. & Hecht, T. 2008. Intercohort cannibalism and post-partum behvaiour of juvenile swordtail, Xiphophorus helleri Heckel (Pisces: Poeciliidae). Aquaculture Research 39, 111-117.

Hecht, T. 2007. Review of feeds and fertilizers for sustainable aquaculture development in sub-Saharan Africa. In M.R. Hasan, T. Hecht, S.S. De Silva and A.G.J. Tacon (eds). Study and analysis of feeds and fertilizers for sustainable aquaculture development. FAO Fisheries Technical Paper. No. 497. Rome, FAO. pp. 77–110.

Gray,M., Hecht, T. & Sauer, W.H.H. 2007. On the feasibility of a directed trap-fishery for panga Pterogymnus laniarius (Sparidae) in South Africa. African Journal of Marine Science, 29(3): 465–472

Thompson, E., Strydom, N, Hecht, T. 2007. larval development of Dagetichtys marginatus (Soleidae) obtained from hormone –induced spawning under atrtificial rearing conditions. Scientia Marina 71(3): 421-428.

Jones, C.L.W., Kaiser, H. & Hecht, T. 2007. Intercohort cannibalism and parturition-associated behaviour of adult swordtail, Xiphophorus helleri Heckel (Pisces: Poeciliidae). Aquaculture Research 38, 718-727.

Lockyear, J., Hecht, T., Kaiser, H., Teske,P.R. 2006. The distribution and abundance of the endangered Knysna seahorse Hippocampus capensis (Pisces: Syngnathidae) in South African estuaries. African Journal of Aquatic Science, 31(2): 275–283

Potts, W., Booth, A., Hecht, T., Andrew, T. 2006. The life history and fishery potential of Labeo umbratus (Teleostei:Cyprinidae) in five small South African reservoirs. Afr. J. Aquat. Sci. 31(2), 285-295.

Potts, W., Booth, A., Hecht, T., Andrew, T. 2006. Predictor variables for moggel (Labeo umbratus) biomass and production in small South African reservoirs. Afr. J. Aquat. Sci. 31: 107-118.

Kruitwagen, G., Hecht, T., Pratap, H.B. & Wendelaar Bonga, S.H. 2006. Changes in morphology and growth of the mudskipper (Periophthalmus argentilineatus) associated with coastal pollution. Marine Biology 149(2): 201-211.

Potts, W., Booth, A., Hecht, T., Andrew, T. 2005. Reproductive biology of a riverine cyprinid, Labeo umbratus (Teleostei: Cyprinidae), in small African reservoirs. Afr. J. Aquat. Sci. 30: 157-165

Davis, J.A., Wille, M. Hecht, T & Sorgeloos, P. 2005. Optimum time for weaning South African mudcrab, Scylla serrata (Forskål) larvae from rotifers to Artemia. Aquaculture International 13 (3): 203 – 216.

Davis, J.A., Wille, M. Hecht, T & Sorgeloos, P. 2005. Optimal first feed organism for South African mud crab, Scylla serrata (Forskål) larvae. Aquaculture International 13 (3): 187 – 201.

Kamukuru, A., Hecht, T & Mgaya, Y.D. 2005. Effects of exploitation on age, growth and mortality of the blackspot snapper, Lutjanus fulviflamma, at Mafia Island, Tanzania. Fisheries Management and Ecology, 12: 45-55.

Davis, J. Churchill, G. Hecht, T. & Sorgeloos, P. 2004. Spawning characteristics of the South African mudcrab Scylla serrata (Forskal) in captivity. J. World Aquaclt. Soc. 35: 121–132.

Vine, N., Leukes, W., Kaiser, H., Baxter J. & Hecht, T. 2004. Competition for attachment of aquaculture candidate probiotic and pathogenic bacteria on fish intestinal mucus. J. Fish. Diseases 27: 319 – 326.

Hecht, T., Irish, A. and J. Sales 2003 — Effect of protein level and varying protein-lipid concentrations on growth characteristics of juvenile spotted grunter Pomadasys commersonnii (Haemulidae). S. Afr. J. mar. Sci. 25: 283-288.

Davis, J.A., Van Blerk, L.L., Kirby, R. & Hecht, T. 2003. Genetic variation in mud crab Scylla serrata (Forskal, 1775) (Crustacea : Portunidae) in South African estuaries. Afr. Zool. 38: 383 – 350.

Mann, BQ, McDonald, A.M, Sauer, W.H.H. & Hecht, T. 2003. Evaluation of participation in and management of the Transkei shore line fishery. Afr. J. Mar. Sci. 25: 79 – 98.

Kaunda, E. and Hecht, T. 2003. Life history traits of Bathyclarias nyasensis (Siluroidei) in Lake Malawi. African Zoology 38 (1): 45 – 55.

Johnston, G., Kaiser, H., Hecht, T. & Oellermann, L.K. 2003. Effect of ration size and feeding frequency on growth, size distribution and survival of juvenile clownfish, Amphiprion percula. J. Appl. Ichthyol. 19: 40-43.

Gordon, A. K. & T. Hecht 2002. Histological studies on the development of the digestive system of the clownfish Amphiprion percula and the time of weaning. Journal of Applied Ichthyology 18(2): 113-117.

Radull, J., Kaiser, H. and Hecht, T. 2002. Stress-related changes in the metabolic rate of juvenile spotted grunter Pomadasys commersonnii (Haemulidae, Pisces). Mar. Freshwater Res, 53(2): 465 – 470.

Gordon, A.K., Kaiser, H., Britz, P.J. & Hecht, T. 2000. Effect of feed type and age-at-weaning on growth and survival of clownfish Amphiprion percula (Pomacentridae). Aquarium Sciences & Conservation 2: 215 – 226.

Hecht T. 2000. Considerations on African aquaculture. World Aquaculture Vol 31(1): 12 – 19.

Oellermann, L.K. and Hecht, T. 2000. Comparison of filet yield, protein content and amino acid profile of the Clarias gariepinus x Heterobranchus longifilis hybrid. Aquaculture Research 31: 553 – 556.

Maartens, L., Booth, A.J. and Hecht, T. 1999. The growth of monkfish Lophius vomerinus in Namibian, waters, with a comparison of otolith and ilicia methods of ageing. Fisheries. Res. 44: 139 – 148.

Kaunda, E and Hecht, T. 1999. Natural diet of Dinotopterus nyassensis (Greenwood 1961) from Lake Malawi. Malawi J. Science 5: 33 – 39.

Hecht, T. and Heasman, K. 1999. The culture of Mytilus galloprovincialis in South Africa and the carrying capacity of Saldanha Bay. World Aquaculture. 30 (4): 50 – 56.

Booth, A.J., Brower, S.L. and Hecht, T. 1999. Considerations on the feasibility of a directed fishery for panga, Pterogymnus laniarius (Pisces:Sparidae). S. Afr. J. Mar. Sci. 21: 77 – 88

Deacon, N. & Hecht, T. (1999). The effect of reduced salinity on growth, food conversion and protein efficiency ratio in juvenile spotted grunter, Pomadasys commersonnii (Telesotei : Haemulidae). Aquaculture Research 30: 13 – 20.

Weyl, O.L.F & Hecht, T. 1999. A successful population of largemouth bass, Micropterus salmoides in a subtropical lake in Mozambique. Env. Biol. Fish. 54: 53 – 66

Hecht, T. & Endemann, F. 1998. The impact of parasites, infections and diseases on the development of aquaculture in sub-Saharan Africa. J. Applied Ichthyology 14: 213 – 221.

Booth, A.J. & Hecht, T. 1998. Changes in the Eastern Cape demersal inshore trawl fishery between 1967 and 1995. S. Afr. J. Mar. Science. 19: 341 – 353.

Jones, C.L.W., Kaiser, H., Webb, G. & Hecht, T. 1998. Filial cannibalism in the swordtail Xiphophorus helleri (Poecillidae). Aquarium Sciences & Conservation 2: 79 – 88.

Burton, S., Kaiser, H. & Hecht,T. 1998. The potential of Artemia mediated delivery of a gonadotropin-relesing hormone analogue to induce ovulation in the cardinal tetra (Paracheirodon axelrodi). Aquarium Sciences & Conservation 2: 89 – 92

Jones, C.L.W., Kaiser, H. & Hecht, T. 1998. Effect of shelter, broodstock numbers and sex ratio on fry production in swordtails, Xiphophorus helleri, under intensive culture conditions. J. World. Aquacult. Soc. 29: 92-96.

Heasman, K. Pitcher, G., Mc McQuaid, C. & Hecht, T. 1998. Shellfish mariculture in theBenguela system: Raft culture of Mytilus galloprovincialis and the effect of rope spacing, on food extraction, growth rate, production and condition of mussels. J. Shellfish Res. 17: 33 – 39.

BRITZ, P.J. & HECHT, T. 1997. Effect of dietary protein and energy level on growth and body composition of South African abalone, Haliotis midae. Aquaculture 156: 195 – 210.

BRITZ, P.J., BACELA, N. & HECHT, T. 1997. Investigations into the ability of Haliotis midae to utilise crystalline arginen. Aquaculture 157: 95 – 105.

BOOTH, A.J. & HECHT, T. 1997. A description of gametogenesis in the panga, Pterogymnus laniarius (Pisces : Sparidae) with comments on changes in maturity patterns over the past two decades. S. Afr. J. Zool. 32: 49 – 55.

BRITZ, P.J., HECHT, T. & S. MANGOLD. 1997. Effect of temperature on growth, feed consumption and nutritional indices of Haliotis midae, fed a formulated diet. Aquaculture 152: 191 – 203.

LOCKYEAR. J., KAISER, H. & HECHT, T. 1997. Studies on the captive breeding of the Knysna seahorse, Hippocampus capensis. Aquarium Sciences and Conservation. 1: 129 – 136.

KAISER, H., BRITZ, P.J. ENDEMANN, F., HASCHICK, R., JONES, C.L.W., KORANTENG, B., KRUGER, D.P., LOCKYEAR, J., OELLERMANN, L.K., OLIVEIR, A.P., ROUHANI, Q. & HECHT, T. 1997. Development of the technology for ornamental fish aquaculture in South Africa. S. Afr. J. Sci. 93(8): 341 – 344

ENDEMANN, F., KAISER, H. & HECHT, T. 1997. Size sorted swordtails, Xiphophorus helleri Heckel 1848 (Family Poecilidae), do not show improved growth. Aquaculture Research 28: 645 – 647.

DEACON, N., HECHT, T. & WHITE, H. 1997. Isolation of the effective concentration of 2-phenoxyethanol for anaesthesia in fish and its effect on growth. Aquarium Science & Conservation 1: 19 – 27.

BRITZ, P.J., HECHT, T & KNAUER, J. 1996. Gastric evacuation time and digestive enzyme activity in abalone, Haliotis midae, fed on a formulated diet. S. Afr. J. Mar. Science. 17:

DEACON. N. & HECHT, T. 1996. The effect of temperature and photoperiod on the growth of juvenile spotted grunter Pomadasys commersonnii (Haemulidae : Pisces). S. Afr. J. Mar. Science. 17: 55 – 60.

HECHT, T. 1996. An alternative life history approach to the nutrition and feeding of silurifrom larvae and early juveniles. Aquat. Liv. Res. 9: 121 – 133.

HECHT, T., OELLERMANN, L. & VERHEUST, L. 1996. Present status and perspectives of Clarias culture in Africa. Aquat. Liv. Res. 9: 197 – 206.

HECHT, T. 1996. The culture of Clarias gariepinus in southern Africa, with comments on the relative futility of subsistence aquaculture in Africa. Proc. World Fisheries Congress 6: 121 – 135.

HECHT, T., BATTAGLENE, S., TALBOT, B. J. 1996. The effect of larval density and food availability on the behaviour of pre-metamorphosis snapper, Pagrus auratus. J. Mar. Freshw. Res. 47(2): 223 – 231.

WEYL, O., KAISER, H. & HECHT, T. 1996. On the efficacy and mode of action of 2-phenoxyethanol as an anaesthetic for goldfish, Carassius auratus (L.), at different temperatures and concentrations. Aquaculture Research 27: 757 – 764.

ANDREW, T.G., BUXTON, C.B. & HECHT, T. 1996. Sex change in a South Atlantic wrasse, Nelabrichthys ornatus from Tristan da Cunha. Env. Biol. Fish. 46: 139 – 149.

WHITE, H.I., HECHT, T. & POTGIETER, B. 1996. The effect of four anaesthetics on Haliotis midae and their suitability for application in commercial abalone culture. Aquaculture 140: 145 – 152.

KNAUER, J., BRITZ, P.J. & HECHT, T. 1996. Comparative growth performance and digestive enzyme activity of juvenile South African abalone, Haliotis midae, fed on diatoms and a practical diet. Aquaculture 140: 75 – 86.

KAISER, H., WEYL, O. & HECHT, T. 1996. “Breath-holding” in Oreochromis mossambicus. S. Afr. J. Sience 92: 152 – 154.

ANDREW, T.G. & HECHT, T. 1996. Age and growth of Sebastes capensis from Tristan da Cunha, South Atlantic. J. Zool., Lond. 238: 125 – 135.

GRIFFITHS, M.H. & HECHT, T. 1995. Age and growth of the dusky kob, Argyrosomus japonicus, based on otoliths. S. Afr. J. Mar. Science. 16: 119 – 128.

HECHT, T. 1995. Situacion actual de la acuicultura en Sudafrica. Aqua Noticias International 27: 55 – 59.

CAMBRAY, J.A. & HECHT, T. 1995. Comparison of the growth of two closely related redfin minnows, Pseudobarbus afer and P.asper in the Gamtoos river system, South Africa. J. Afr. Zool. 109: 349 – 376.

GRIFFITHS, M.H. & HECHT, T. 1995. On the life history of Atractoscion aequidens, a migratory sciaenid off the east coast of southern Africa. J. Fish Biol. 47: 962 – 985.

SMALE, M.J., WATSON, G., HECHT, T. 1995. Otolith Atlas of Southern African Marine Fishes. Ichthyol. Monogr. JLB Smith Inst. Ichthyol. No. 1. xiv, 253 p, 149 plates.

DEACON, N. & HECHT, T. 1995. Observations on the thermoregulatory behaviour of spotted grunter Pomadasys commersonnii juveniles. J. Appl. Ichthyol. 11: 100-110.

KAISER, H., HECHT, T. & WEYL, O. 1995. The effect of density on the behaviour of Clarias gariepinus larvae. J. Appl. Ichthyol. 11: 25-36.

KAISER, H., WEYL, O. & HECHT, T. 1995. The effect of stocking density on growth, survival and agonistic behaviour of African catfish. Aquacult. Internat. 3: 217 – 225.

ANDREW, T.G., HECHT, T. HEEMSTRA, P.C. & LUTJEHARMS, J.R.E. 1995. The fishes of the Tristan da Cunha archipelago and Gough Island. Ichthyol. Bull. J.L.B. Smith Inst. Ichthyol. 66: 48p.

SCHOONBEE, H.J., HECHT, T., SAAYMAN, J.E., POLLING, L. 1995. Fish population assessment in a temperate lowveld impoundment of the Transvaal, South Africa. Water SA 21: 147 – 152.

KNAUER, J., HECHT, T., BRITZ, P. J. 1995. A note on the feeding behaviour and growth of juvenile South African abalone, Haliotis midae, fed on an artificial diet. S. Afr. J. Sci. 91: 91-93.

KNAUER, J., BRADY, D., DUNCAN, J.R. & HECHT, T. 1995. Amino acid, fatty acid and mineral element profile of juvenile South African abalone, Haliotis midae L. Aquacult. Res. 26: 283 – 288.

HECHT, T. 1994. Behavioural thermoregulation of the abalone, Haliotis midae, and the implications for intensive culture. Aqua¬culture. 126: 171 – 181.

KNAUER, J., HECHT, T., DUNCAN, J. 1994. Proximate composition of the South African abalone, Haliotis midae (Haliotidae, Gastropoda). Aquacult. Fish. Managmt. 25: 351 – 354.

BRITZ, P.J., HECHT,T., KNAUER, J., DIXON, M. 1994. The development of an artificial feed for abalone farming. S. Afr. J. Science. 90: 7-8.

KNAUER, J., BRITZ, P.J. and HECHT, T. 1993. The effect of seven binding agents on 24-hour water stability of an artificial weaning diet for the South African abalone, Haliotis midae (Haliotidae, Gastropoda). Aquaculture 115: 327 – 334.

HECHT, T. and PIENAAR, A.G. 1993. A review of cannibalism and its implications in fish larviculture. J. World Aquacult. Soc. 24: 246 – 261.

TILNEY, R.L. & HECHT, T. 1993. Early ontogeny of Galeich¬thys feliceps Valenciennes from the south east coast of South Africa. J. Fish Biol. 43: 183 – 212.

ANDREW, T. & HECHT, T. 1992. Feeding biology of Acanthola¬tris monodactylus (Pisces) at Tristan da Cunha and Gough Island, South Atlantic. S. Afr. J. Antarct. Res. 22: 41 – 49.

HECHT, T. & BRITZ, P.J. 1992. The current status, future pros¬pects and environmental implications of mariculture in South Africa. S. Afr. J. Science 88: 335 342.

HECHT, T. & VAN DER LINGEN, C.D. 1992. Turbidity induced changes in feeding strategies of fish in estuaries. S. Afr. J. Zool. 27(3): 95 107.

THORPE, P.S. & HECHT, T. 1992. Feeding frequency, daily ration and feed utilisation of an optimal dry diet for early juvenile Oreochromis mossambicus. Water SA 18: 53 56.

COOPER, J., CRAFFORD, J.E. & HECHT, T. 1992. Introduction and extinction of brown trout (Salmo trutta L.) in an impoverished subantarctic stream. Antarct. Science 4: 9 14.

HECHT, T. & McEWAN, A.G. 1992. Changes in gross protein and lipid requirements of rainbow trout, Oncorhynchus mykiss (Walbaum), at elevated temperatures. Aquacult. Fish. Managmt. 23: 133 148.

HECHT, T., BRITZ, P.J. & UYS, W. 1992. Aquaculture in South Africa. World Aquaculture 23 (1): 7 19.

DIXON, M.G., HECHT, T. & BRANDT, C.R. 1991. Identification and treatment of a Clostridium and Vibrio infection in South African abalone, Haliotis midae L. J. Fish Diseases 14: 693 695.

HECHT, T, LUBLINKHOF,W. & KENMUIR, D. 1991. Induced spawning of the vundu Heterobranchus longifilis and embryo survival rates of pure and reciprocal clariid crosses. S. Afr. J. Wildl. Res. 21(4): 123 125.

NAISH, K A, HECHT, T. AND PAYNE, A.I.L. 1991. Growth of South African horse mackerel Trachurus trachurus capensis off South Africa. S. Afr. J. Mar. Science 10: 29 35.

HECHT, T. 1991. Otoliths: an introduction to their morphology and use in the identification of Southern Ocean fishes. pp. 64 69 (plus 112 descriptions and illustrations) In: Fishes of the Southern Ocean. Gon, O. and Heemstra, P.C. (Eds.). JLB Smith Institute, Grahamstown, 462 pp.

HECHT, T. and BRITZ, P.J. 1990. Aquaculture in South Africa: history, status and prospects. Aquaculture Assoc. South Africa. Lynnwood Ridge, Pretoria. 58pp.

HECHT, T. 1990. On the life history of Cape horse mackerel, Trachurus trachurus capensis off the south east coast of South Africa. S. Afr. J. Mar. Science 9: 317 326.

TILNEY,R.L. and HECHT,T. 1990. The food and feeding of two co occurring marine catfish, Galeichthys feliceps and G. ater (osteichthyes : Ariidae) along the south east coast of South Africa. J. Zool. Lond. 221: 171 193.

MAYEKISO, M. & HECHT, T. 1990. The feeding and reproductive biology of a South African anabantid fish, Sandelia bainsii. Rev. d’hydrobiol. Tropicale 23: (3): 219 230.

HECHT,T and TILNEY,R.L. 1989. The Port Alfred fishery: A descrip¬tion and preliminary evaluation of a commercial linefishery on the South African east coast. S. Afr. J. Mar. Sci. 8: 103 117.

BRITZ, P.J. and HECHT,T. 1989. The effect of salinity on the growth and survival of African sharptooth catfish, Clarias garie¬pinus larvae. J. Appl. Ichthyol. 5: 194 202.

VAN DAMME, P.,APPELBAUM,S and HECHT,T. 1989. Sibling cannibalism in Koi carp, Cyprinus carpio L. larvae and juveniles. J. Fish Biol. 34 (6): 855 864.

LAURENSON, L.J.B., HOCUTT, C.H. and HECHT,T. 1989. An evaluation of the success of invasive fish species of the Great Fish River. J. Appl. Ichthyol. 5 (1): 28 34.

UYS, W. and HECHT, T. 1988. Production and grow out. In: Hecht, T., Uys, W. and Britz, P.J. (Eds). A guide to the culture of the sharptooth catfish, Clarias gariepinus in southern Africa. South African National Scientific Programmes Report. (153): 62 72.

BRITZ, P.J. and HECHT, T. 1988. Artificial propagation and fry production. In: Hecht, T., Uys, W. and Britz, P.J. (Eds). A guide to the culture of the sharptooth catfish, Clarias gariepinus in southern Africa. South African National Scientific Pro¬grammes Report. (153): 36 46.

HECHT,T. 1988. An overview of the development of clariid catfish culture, with particular reference to southern Africa. In: Hecht, T., Uys, W. and Britz, P.J. (Eds) . A guide to the culture of the sharptooth catfish, Clarias gariepinus in southern Africa. South African National Scientific Programmes Report. (153): 12 26.

MAYEKISO, M. and HECHT, T. 1988. Age and growth of Sandelia bainsii (Pisces: Anabantidae). S. Afr. J. Zool. 23 (4): 295 300.

MAYEKISO, M and HECHT, T. 1988. Conservation status of the anabantid fish Sandelia bainsii in the Tyume River, South Africa. S. Afr. J. Wildl. Res. 18(3): 101 108.

HECHT, T. 1988. Aquaculture. de Jager Haum, Pretoria, 55 p.

DE MERONA, B., HECHT,T. and MOREAU,J. 1988. Growth of African freshwater fishes. In: The biology and ecology of African freshwater fishes : A synthesis. C. Leveque, M. N. Bruton and G. Ssentogo (Eds). ORSTOM, Paris. pp. 191 220.

HECHT,T. and APPELBAUM,S. 1988. Observations on intraspecific aggression and coeval sibling cannibalism by larval and juvenile Clarias gariepinus (Clariidae : Pisces) under controlled condi-tions. J. Zool. Lond. 214 (1): 21 44.

HECHT, T. 1987. A guide to the otoliths of southern ocean fishes. S. Afr. J. Ant. Res 17(1): 1 89.

UYS, W., HECHT, T. and WALTERS, M. 1987. Changes in digestive enzyme activities of Clarias gariepinus (Pisces : Clariidae) after feeding. Aquaculture. 63: 243 250.

UYS, W. and HECHT,T. 1987. Assays on the digestive enzymes of sharptooth catfish, Clarias gariepinus (Pisces : Clariidae). Aquaculture. 63: 301 313.

HECHT,T. and APPELBAUM,S. 1987. Notes on the growth of Israeli sharptooth catfish (Clarias gariepinus) during the primary nursing phase. Aquaculture. 63: 195 204.

BRITZ,P. and HECHT,T. 1987. Temperature preferences and optimum temperature for growth of African sharptooth catfish (Clarias gariepinus) larvae and post larvae. Aquaculture.

GRIFFITHS, M.H. and HECHT,T. 1986. Age and growth of the monkfish from the Agulhas Bank. S. Afr. J. Mar. Sci. 4: 51 60.

HECHT, T. and COOPER,J. 1986. Length/mass relationships, energetic content and the otoliths of Antarctic cod Paranotothenia magellanica (Nototheniidae : Pisces) at sub Antarctic Marion Island.S. Afr. J. Zool 21: 294 296.

HEEMSTRA, P.C. and HECHT,T. 1986. Dinopercidae, a new family for the percoid marine fish Genera Dinoperca Boulenger and Centrarchops Fowler (Pisces: Perciformes). Ichthyological Bulletin of the J.L.B. Smith Institute of Ichthyology (51): 1 20.

UYS, W. and HECHT,T. 1985. Evaluation and preparation of a suitable dry feed and optimal feeding frequency for the primary nursing of Clarias gariepinus larvae (Pisces : Clariidae). Aquaculture 47: 173 183.

HECHT, T. and LUBLINKHOF,W. 1985. Heterobranchus longifilis x Clarias gariepinus (Clariidae : Pisces) : A new hybrid for aquaculture? S. Afr. J. Science. 81: 620 – 621.

LA COCK, G., HECHT,T. and KLAGES,N. 1984. The winter diet of Gentoo penguins (Pygoscelis papua) at Marion Island. Ostrich. 55 : 188 191.

McEWAN, A. and HECHT,T. 1984. Age and growth of the longfin eel Anguilla mossambica (Pisces : Anguillidae). S. Afr. J. Zool. 19 : 280 285.

HECHT, T. and ZWAY,P. 1984. On the stunted mozambique tilapia Oreochromis mossambicus (Pisces : Cichlidae) of the Matiovila hot spring, Kruger National Park. Koedoe 27: 25 38.

DUFFY, D.C. and HECHT, T. 1984. Ship followers and seabird counts: Observer’s distance from stern may affect counts. Cormorant 12: 44 48.

COOPER, J., HECHT,T., ENTICOTT,J.W. and KLAGES,N. 1984. Prey from three chinstrap penguins (Pygoscelis antarctica) at Bouvet Island, December 1982. S. A. J. Antarctic Res.14:32 33.

HECHT, T., POLLING,L. and MOKGALONG,N.M. 1983. The fishes of the Limpopo and Olifants river tributaries (Limpopo Drainage Basin, South Africa). Part IV. Annotated checklist of the fishes of the Nwanedi tributary of the Limpopo River. Univ. of the North Series A 29: 1 9.

HECHT, T. and SCHOLTZ,A.T.J. 1983. The fishes of the Limpopo and Olifants river tributaries (Limpopo Drainage Basin, South Africa). Part III. Annotated checklist of the fishes of the Steelpoort tributary of the Olifants River. Univ. of the North Series A 28 : 1 11.

HECHT, T. 1982. On the enigmatic otoliths and the systematic position of the teleostean genera Adioryx, Holocentrus and Flammeo (Holocentridae : Beryciformes). Israel J. Zoology 31 (1 2) : 39 46.

HECHT, T., SAAYMAN,J.E. and POLLING,L. 1982. Further observations on the induced spawning of the sharptooth catfish, Clarias gariepinus (Clariidae : Pisces). Water S.A. 8 (2) : 101 107.

HECHT, T. 1982. New distributional record of Glossogobius giuris (Pisces : Gobiidae) in the Limpopo River. S. Afr. J. Sci. 78 : 295.

HECHT, T. 1982. Intensive rearing of sharptooth catfish larvae (Clarias gariepinus, Clariidae : Pisces). S. Afr. J. Wildl. Res. 12 (3) : 101 105.

HECHT, T. and VILJOEN, J.H. 1982. The suitability of various dry feeds for the commercial rearing of common carp larvae Cyprinus carpio. Water S.A. 8 (1) : 58 65.

HECHT, T. and APPELBAUM, S. 1982. The morphology and taxonomic significance of the otoliths of some bathypelagic Anguilloidei and Saccopharyngoidei (Pisces : Anguilliformes) from the Sargasso Sea. Helgoländer Meeresunters. 35 : 301 308.

HECHT, T. and HECHT, A. 1981. A descriptive systematic study of the otoliths of the Neopterygean marine fishes of South Africa. Part IV. Siluriformes and Myctophiformes. Trans. roy. Soc. S. Afr. 44 : 401 440.

HECHT, T., POLLING, L. and SAAYMAN, J.E. 1981. First record of the snake catfish Clarias theodorae (Weber, 1898) (Clariidae : Pisces) from the Transvaal, South Africa. J. Limnol. Soc. sthn. Afr. 7 (2) : 57 58.

HECHT, T. and MASHEGO,S.N. 1981. The fishes of the Limpopo and Olifants river tributaries (Limpopo drainage basin, South Africa). Part II. Annotated checklist of the fishes of the Mohlapitse tributary of the Olifants River. Univ. of the North Series A 26 : 1 10.

HECHT, T. and SAAYMAN, J.E. 1981. The fishes of the Limpopo and Olifants river tributaries (Limpopo drainage basin, South Africa). Part I. Introduction. Univ. of the North series A 25 : 1 5.

HECHT, T. 1981. Rearing of sharptooth catfish larvae (Clarias gariepinus Burchell, 1882: Clariidae) under controlled condi¬tions. Aquaculture 24 : 301 308.

SCHOONBEE, H.J., HECHT,T., POLLING,L. and SAAYMAN,J.E. 1980. Induced spawning of and hatchery techniques with the sharptooth catfish Clarias gariepinus (Clariidae: Pisces). S. Afr. J. Sci. 76 : 364 368.

HECHT, T. 1980. Age, growth and reproduction and mortality of the butter catfish, Eutropius depressirostris (Schilbeidae : Pisces) in the Luphephe/Nwanedzi Impoundment, Venda (Southern Africa). J. Limnol. Soc. sthn. Afr. 6 : 39 45.

HECHT, T. 1980. A comparison of the otolith and scale methods of ageing and the growth of Sarotherodon mossambicus (Pisces : Cichlidae) in a Venda impoundment (Southern Africa). S. Afr. J. Zool. 15 : 222 228.

HECHT, T. 1979. The value of otoliths in fresh water fisheries biology and taxonomy. Univ. of the North Series A 19 : 1 17.

HECHT, T. and HECHT, A. 1979. A descriptive systematic study of the otoliths of the Neopterygean marine fishes of South Africa. Part III. Elopiformes, Gonorhynchiformes, Clupeiformes and Salmoniformes. Trans. roy. Soc. S. Afr. 44 : 73 95.

HECHT, T. and APPELBAUM, S. 1978. Otolith length/fish length relationship of leptocephali, elvers and reared subadult eels (Anguilla anguilla). Env. Biol. Fish. 3 : 245 247.

HECHT, T. and HECHT, A. 1978. A descriptive systematic study of the otoliths of the Neopterygean fishes of South Africa. Part II. The delimination of teleost orders, some systematic notes and a provisional new phyletic order sequence. Trans. roy. Soc. S. Afr. 43: 199 218.

HECHT, T. 1978. A descriptive systematic study of the otoliths of the Neopterygean marine fishes of South Africa. Part I. Introduction. Trans. roy. Soc. S. Afr. 43: 191 197.

POST, A. and HECHT,T. 1977. Results of the research cruises of the FRV Walther Herwig to South America XLIX. The otoliths of Diretmus species. Mitt. Hamburg Zool. Mus. Inst. 74: 165 170.

HECHT, T. 1977. The trawl fishery of the eastern Cape coast. S. A. Shipp. News Fish. Ind. Rev. 32 (5) : 47 51
.
HECHT, T. 1977 A note on photographing otoliths. Zool. Afr. 12 : 497.

HECHT, T. and BAIRD,D. 1977. Contributions to the biology of the panga Pterogymnus laniarius (Pisces : Sparidae) : Age, growth and reproduction. Zool. Afr. 12: 363 372.

HECHT, T. 1977. Contributions to the biology of the gurnard, Trigla capensis (Pisces: Triglidae) : Age, growth and repro¬duction. Zool. Afr. 12 : 373 382.

HECHT, T. 1975. Blood calcium values of Sesarma catenata (Ort.) (Crustacea : Brachyura) during the moulting cycle. S. Afr. J. Sci. 71: 281 – 281.

PUBLISHED BOOKS AND CHAPTERS IN BOOKS

HECHT, T. et.al. 1996. South African Water Quality Guidelines (2nd edition). Vol. 6. Agricultural Water Use: Aquaculture. Dept. of Water Affairs and Forestry, Pretoria. 193p.

HECHT, T. 1991. Otoliths: an introduction to their morphology and use in the identification of Southern Ocean fishes. pp. 64 69 (plus 112 descriptions and illustrations) In: Fishes of the Southern Ocean. Gon, O. and Heemstra, P.C. (Eds.). JLB Smith Institute, Grahamstown, 462 pp.

HECHT, T. and BRITZ, P.J. 1990. Aquaculture in South Africa: history, status and prospects. Aquaculture Assoc. South Africa. Lynnwood Ridge, Pretoria. 58pp.

HECHT, T. 1988. Aquaculture. de Jager Haum, Pretoria, 55 p.

DE MERONA, B., HECHT, T. & MOREAU, J. 1988. Growth of African freshwater fish. In: Leveque, C., Bruton, M.N. & Ssentongo, G.W., Biology and Ecology of African Freshwater Fishes. pp. 191 – 221. ORSTOM, Paris.

HECHT, T., UYS, W. and BRITZ, P.J. (EDS). 1988. A guide to the culture of the sharptooth catfish in southern Africa. South African National Scientific Programmes Report. (153): 1 106.

HECHT,T. 1988. An overview of the development of clariid catfish culture, with particular reference to southern Africa. In: Hecht, T., Uys, W. and Britz, P.J. (Eds) . A guide to the culture of the sharptooth catfish, Clarias gariepinus in southern Africa. South African National Scientific Programmes Report. (153): 12 26.

UYS, W. and HECHT, T. 1988. Production and grow out. In: Hecht, T., Uys, W. and Britz, P.J. (Eds). A guide to the culture of the sharptooth catfish, Clarias gariepinus in southern Africa. South African National Scientific Programmes Report. (153): 62 72.

BRITZ, P.J. and HECHT, T. 1988. Artificial propagation and fry production. In: Hecht, T., Uys, W. and Britz, P.J. (Eds). A guide to the culture of the sharptooth catfish, Clarias gariepinus in southern Africa. South African National Scientific Pro¬grammes Report. (153): 36 46.

EDITED CONFERENCE AND WORKSHOP PROCEEDINGS
Hasan, M., Hecht, T, De Silva, S & Tacon, A. (Eds.) 2007. Study and analysis of feeds and fertilizers from sustainable aquaculture development. FAO Fisheries Technical Paper 497. 510p.

Shipton, T.A. and T. Hecht. 2005. A synthesis of the formulated animal and aquafeed industry in sub-Saharan Africa. In: Moehl, J.; Halwart, M. (eds.) CIFA Occasional Paper. No. 26. Rome, FAO. 2005. 14-24.

BOOTH, A.J and HECHT, T. 2000. Utilisation of South Africa’s living marine resources. In: Summary Marine Biodiversity Status Report for South Africa. Durham, B.D. & Pauw, J.C. (eds). Pp. 57 – 67. National Research Foundation, Pretoria.

HECHT, T. 1999. Lesotho Fisheries Project, Katse Dam Trout Aquaculture Feasibility Study. Lesotho Highlands Development Authority. 79p plus 4 Appendices.

COWLEY, P.D., WHITFIELD, A.W. & HECHT, T. 1998. Estuarine Mariculture in South Africa: Strategic options for development and management. SANCOR Occ. Rep. 4: 80p.

Chimatiro, S.K., Hecht, T & Scholz, U. 1998 (Oral). Ecological characteristics of the Lower Shire Floodplain in Malawi, and its implications for fisheries management. International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998.

HECHT, T. et.al. 1996. South African Water Quality Guidelines (2nd edition). Vol. 6. Agricultural Water Use: Aquaculture. Dept. of Water Affairs and Forestry, Pretoria. 193p.

HECHT, T. & BRITZ, P.J. (EDS) 1993. AQUACULTURE ’92. Proc. Aquacult. Assoc. sthn. Afr. (1) 198pp.

HECHT, T., UYS, W. and BRITZ, P.J. (EDS). 1988. A guide to the culture of the sharptooth catfish in southern Africa. South African National Scientific Programmes Report. (153): 1 106.

HECHT, T. & SMALE, M.J. (EDS) 1986. Proceedings of a workshop on age determination and growth modelling of South African Marine Linefish. JLB Smith Institute of Ichthyology Invest. Rep. 21: 40 pp.

WALMSLEY, D., HECHT,T. & BRUTON,M.N.(EDS) 1986. Water quality maintenance in intensive aquaculture. Foundation for Research Development, CSIR. Ecosystems Programmes Occasional Report (4) : 1 46.

HECHT, T., M.N. BRUTON & O. SAFRIEL. (EDS) 1985. Aquaculture ’84. Ecosystems Programmes Occasional Report (1): 1 156.

—————————————————————————————————————————————–
CONFERENCE PRESENTATIONS
Hecht, T. 2010. Overview of mariculture activities in South Africa. Presented at the WIOMSA, IFS workshop on “Mariculture in WIO region – Challenges and Prospects”, Zanzibar, 30 Nov to 3 Dec 2009.

Hecht, T. 2006. Regional review of aquaculture development. 4. Sub-Saharan Africa – 2005. FAO Fisheries Circular. No. 1017/4. Rome, FAO. 2006. 96 pp.

GRIFFITHS, M.H. & HECHT, T. 1990. Western boundary current migrations: Their ecological significance and implications for fisheries management. (7th National Oceanographic Symposium, San Lemeer, June 1990).Shipton, T.A. and T. Hecht. 2005. A review of the animal and aquafeed industries in South Africa In: Moehl, J.; Halwart, M. (eds.) A synthesis of the formulated animal and aquafeeds industry in sub-Saharan Africa. CIFA Occasional Paper. No. 26. Rome, FAO. 2005. 1-13.

Bernatzeder, A.K., Cowley, P.D. and T. Hecht. 2008. Salinity induced physiological responses in dusky kob, (Pisces: Sciaenidae). South African Marine Science Symposium, Cape Town, South Africa.

Donovan, B., Hecht, T and Weyl, O. 2008. Towards greater accuracy in the estimation of time-based nominal effort for a small-scale, boat based linefishery. South African Marine Science Symposium, Cape Town, South Africa.

Hecht, T and Jones, C.W. 2007. The use of wild fish as feed in aquaculture and the implications for food security and poverty alleviation in Africa and the Near East.

FAO Expert Workshop on fish and other aquatic organisms as feed in aquaculture. Cochin, India. 16-18 November 2007.

Bernatzeder,A., Cowley, P., Hecht, T. Salinity induced physiological responses in dusky kob, (Argrosomus Japonicus) Pisces:Sciaenidae. Aquaculture Africa, 8th Conferecne of the Aquaculture Association of southern Africa, 22-26 October 2007.

Thompson, E. Ende, S., Markovina,M., Kaiser, H., Hecht, T. Mariculture outlook and research of the white-margined sole, Synaptura marginata. Aquaculture Africa, 8th Conferecne of the Aquaculture Association of southern Africa, 22-26 October 2007.

Hecht, T. 2006. A review of aquaculture in sub Saharan Africa. FAO Expert Workshop on Global Aquaculture, Guangzou, China, March 2006.

Hecht, T. 2006. A review of feeds and fertilizers for sustainable aquaculture development in sub-saharan African countries. FAO / NACA Expert Workshop on “The use of feeds and fertilizers for sustainable aquaculture development”, Wuxi, China. March 2006

Ende, S. and Hecht, T. 2006. Osteological development of the feeding apparatus in the white-margined sole, Synaptura marginata. World Aquaculture Society Conference, Florence, Italy, May 2006.

Hecht, T. 2005. A synopsis of Sub-Saharan African aquaculture. FAO (UN) Expert Workshop on African Aquaculture, Mombasa, 20-26 Sept.2005.

Thompson, E. and Hecht, T. 2005. Research on sole aquaculture in South Africa – road to commercialisation. 12th Southern African Marine Science Symposium, Durban. 4-7 July 2005.

Thompson, E., Strydom, N, and Hecht, T. 2005. Larviculture of the soleid Synaptura marginata. 12th Southern African Marine Science Symposium, Durban. 4-7 July 2005.

Hecht, T. 2005. The dichotomy of African aquaculture and the poverty trap.7th Bi-annual Conference of the Aquaculture Association of southern Africa. Grahamstown. 12-16 September 2005

Andrew, T.G., Weyl, O.L.F., Andrew, M. & Hecht, T. 2005. The contribution of aquaculture to livelihoods of smallholder farmers in Malawi. 7th Bi-annual Conference of the Aquaculture Association of southern Africa. Grahamstown. 12-16 September 2005

Thompson, E. and Hecht, T. 2005. Selection criteria for new aquaculture species in South Africa. 7th Bi-annual Conference of the Aquaculture Association of southern Africa. Grahamstown. 12-16 September 2005

Markovina, M. and Hecht, T. 2005. Cryogenic storage of sperm of the white margined sole, Synaptura marginata. 7th Bi-annual Conference of the Aquaculture Association of southern Africa. Grahamstown. 12-16 September 2005

Ende, S. and Hecht. T. 2005. Morphological aspects of the jaw development of the white margined sole, Synaptura marginata in relation to feeding behaviour. 7th Bi-annual Conference of the Aquaculture Association of southern Africa. Grahamstown. 12-16 September 2005

Hecht, T. 2005. Commercialization of aquaculture. Malawi Int. Aquaculture Conference, Lilongwe. May 2005.

Southern African Marine Science Symposium July 2002, Swakopmund Namibia

Hecht, T. and Mperdempes, J. 2002. Cage culture of kob, Argyrosomus japonicus. Southern African Marine Science Symposium July, 2002. Swakopmund Namibia

Hecht, T. 2002. Strategies and measures for sustainable aquaculture in sub-Saharan Africa. World Aquaculture Society Conference, Beijing, May 2002.

Jones, C., Kaiser, H. & Hecht, T. 2002. Behavioural observations on filial cannibalism as a tool to improve juvenile production in sword tail Xiphophorus helleri under farming conditions. World Aquaculture Society Conference, Beijing, May 2002.

Hecht, T. Kaiser, H & Oellermann, L.K. 2002. Zootechnical advances in the culture of marine aquarium fish in South Africa World Aquaculture Society Conference, Beijing, May 2002.

E. Thompson & T. Hecht. 2002. Screening of sole, Synaptura marginata as a candidate for aquaculture. Indigenous Aquaculture for Sustainable Development. 6th Conference of the Aquaculture Association of Southern Africa. 10th – 13th September 2002, Stellenbosch,

G. Churchill, T. Hecht, J. Davis. 2002. An investigation into the brood stock and egg characteristics of the mud crab (Scylla serrata) in captivity. Indigenous Aquaculture for Sustainable Development. 6th Conference of the Aquaculture Association of Southern Africa. 10th – 13th September 2002, Stellenbosch,

N.G. Vine, W. Leukes , H. Kaiser & T. Hecht, 2002. Criteria for the selection of probiotic bacteria for marine fish larviculture. Indigenous Aquaculture for Sustainable Development. 6th Conference of the Aquaculture Association of Southern Africa. 10th – 13th September 2002, Stellenbosch,

C.L.W. Jones, H. Kaiser and T. Hecht. 2002. The mitigation of cannibalism under culture conditions based on behavioural observations, using the swordtail (Xiphophorus helleri) as a model species. Indigenous Aquaculture for Sustainable Development. 6th Conference of the Aquaculture Association of Southern Africa. 10th – 13th September 2002, Stellenbosch,

Mather, D, Btitz, P. Sauer, W. Hecht, T. & Oellermann, L.K. 2002. Economic and sectoral study of the South African Fishing Industry. Southern African Marine Science Symposium, Swakopmund, Namibia. 1-5 July 2002.

Bacela, N. & Hecht, T. 2002. The influence of feeding frequency and stocking density on growth of juvenile spotted grunter, Pomadasys commersonnii, under tank culture conditions. Southern African Marine Science Symposium, Swakopmund, Namibia. 1-5 July 2002.

Bacela, N. & Hecht, T. 2002. The effect of size manipulaton on growth of juvenile spotted grunter, Pomadasys commersonnii. Southern African Marine Science Symposium, Swakopmund, Namibia. 1-5 July 2002.

Bacela, N. & Hecht, T. 2002. Growth performabnce and prediction of rearing time of juvenile spotted grunter, Pomadasys com ersonnii, under ambient temperture conditions. Southern African Marine m Science Symposium, Swakopmund, Namibia. 1-5 July 2002.

Hecht, T. 2001. Strategies and measures for sustainable aquaculture in sub-Saharan Africa. Invited paper presented at: Expert Consultation On Indicators Of Sustainable Aquaculture Development , Rome, Italy, 24 – 27 September 2001

Hecht, T. 2001. Alternative approaches for the development of aquaculture in sub-Saharan Africa and implications for research. Paper presented at ICLARM, Africa and West Asia Program Development Workshop, Abassa, Egypt. 23-25 April 2001.

Hecht, T. & Mperdempes, A.J. 2001. Screening of Argyrosomus japonicus (Sciaenidae) and Pomadasys commersonnii (Haemulidae) as candidates for aquaculture in South Africa. World Aquaculture Society Conference. Orlando Florida, 21-25 Jan 2001.**, ***

Hecht, T. 2001. Fundamentals for sustainable aquaculture in Africa. World Aquaculture Society Conference. Orlando Florida, 21-25 Jan 2001.

Hecht, T. 2000. Realism in South African aquaculture: reflections and considerations. Opening Address- Aquaculture Africa. 5th Symposium Aquaculture Association of southern Africa. Pretoria. 26 – 28 September 2000.

Hecht, T. 2000. South African mariculture: Status, Constraints and Opportunities. Aquaculture Africa. 5th Symposium Aquaculture Association of southern Africa. Pretoria. 26 – 28 September 2000.

Hecht, T. 2000. Assessment of research needs for aquaculture development in South Africa and opportunities for collaboration. Presented at Aqua 2000: World Aquaculture Society Symposium, Nice. May 2000 and published in Cooperative Aquaculture Research in Developing Countries EU INCO Project ICA4 – 1999 – 50022. pp. 217 – 224.

Hecht, T. 2000. African aquaculture: Perpetuation of a myth or time for change. Presented at Aqua 2000: World Aquaculture Society Symposium, Nice. May 2000. and published in European Aquaculture Society, Spec. Publ. (28): 257.

Hecht, T. 1999. A perspective on South African Aquaculture. Proceedings Nat. Workshop: Planning for Sustainable Development of Mariculture in South Africa. Marine & Coastal Management, DEA&T, Cape Town, October 1999, p24 – 33

Britz, P.J. and Hecht, T. 1999. Critical needs for aquaculture sector planning in South Africa. Proceedings Nat. Workshop: Planning for Sustainable Development of Mariculture in South Africa. Marine & Coastal Management, DEA&T, Cape Town, October 1999, p.18 – 23

Johnston, G., Kaiser, H. Hecht. 1999. Rearing of clownfish juveniles. 10th SAMS Symposium, Wilderness, October 1999.

Hecht, T. Mariculture in South Africa: Constraints and opportunities. Bilateral France / South African Mariculture Workshop, IFREMER, La Rochelle, France, September 1999 (Oral).

Hecht, T. 1999 (Oral). A perspective on South African aquaculture. Realites et perspectives du development de l’aquaculture dans le sud oest de l’ocean Indien. Reunion. 31 May – 3 June 1999.

Chimatiro, S.K., Hecht, T & Scholz, U. 1998 (Oral). Ecological characteristics of the Lower Shire Floodplain in Malawi, and its implications for fisheries management. International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998. *,***

Kaunda, E. & Hecht, T. 1998 (Poster). On the feeding biology of Dinotoperus nyassensis in Lake Malawi. International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998.*, ***

Scott, L. & Hecht, T. 1998 (Poster). The effect of light wavelength on the growth rate, food conversion ratio and condition of juvenile spotted grunter, Pomadasys commersonnii. International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998.*, ***

Johnston, G, Hecht, T. & Oellermann, L.K. 1998 (Poster). Aspects of larval rearing of Clarke’s clownfish (Amphiprion clarkii). International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998.**,**

Haschick, R, Hecht, T. & Kaiser, H. 1998 (Poster). Effect of light intensity on the reproductive behaviour of the skunk clownfish, Amphiprion akallopisos. International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998. *, ***

Endemann, F. Kaiser, H. & Hecht, T. 1998 (Poster). Comparison of two live feeds, two dry feeds and combinations thereof on the growth of and survival of larval goldfish, Carassius auratus. International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998.*, ***

Nthimo, M. & Hecht, T. 1998 (Poster). The development of a subsistence fishery on Khatse reservoir, Lesotho. International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998.*,***

Vine, N.G. & Hecht, T. 1998 (Oral). Aspects of the biology of the doublesash butterfly, Chaetodon marleyi (Chaetontidae). International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998.*, ***

Oellerman, L.K. & Hecht, T. 1998. (Oral). The optimum density for intensive culture of a hybrid clariid (Heterobranchus longifilis x Clarias gariepinus). International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998.*, ***

Lockyear, J., Hecht, T. & Kaiser, H. 1998. (Oral). The effects of broodstock conditioning diets on reproductive output of the Knysna seahorse, Hippocampus capensis, and fitness of the young. International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998.*, ***

Gordon, A., Kaiser, H., Britz, P.J. & Hecht, T. 1998. (Oral) A preliminary investigations of the effect of diet and age at weaning on growth and survival of clownfish Amphiprion percula. International Conference, African Fish and Fisheries: Diversity and Utilisation, Grahamstown. September 1998.*, ***

LOCKYEAR, J., HECHT, T. & KAISER, H. Studies on captive breeding of the Knysna seahorse Hippocampus capensis. Aquarama ’97, Singapore, May 1997.

HECHT, T. & BRITZ, P.J. 1997. x, xxx Advances in South African aquauclutre during the period 1993 to 1996. 4th Congress Aquaculture Association of southern Africa, Stellenbosch, September 1997.

BRITZ, P.J. & HECHT, T. Critical needs for aquaculture sector development in South Africa. Workshop – Fishing for a Future, Agriculltural Research Council, Pretoria, November 1997.

OELLERMANN, L.K. & HECHT, T. x, xxx Breeding and rearing of clownfish species (Amphiprion and Premnas species). 4th Congress Aquaculture Association of southern Africa, Stellenbosch, September 1997.

JOHNSTON, G., OELLERMANN, L.K. & HECHT, T. x, xxx Aspects of larval rearing of Clarke’s clown fish , Amphiprion clarkii. 4th Congress Aquaculture Association of southern Africa, Stellenbosch, September 1997.

HECHT, T. 1996. * ** ***. The need for an aquaculture development plan for South Africa. Proc. Aquacult. Assoc. sthn. Afr. 5: 8 – 12. (3rd Congress Aquaculture Association of southern Africa, Aquaculture 94, Berg-n-dal, Kruger National Park, September 1994)

OELLERMANN, L.K. & HECHT, T. 1996. * ** ***. High density culture of hybrid catfish. Proc. Aquacult. Assoc. sthn. Afr. 5: 116 – 124. (3rd Congress Aquaculture Association of southern Africa, Aquaculture 94, Berg-n-dal, Kruger National Park, September 1994)

WHITE, H.I. & HECHT, T. 1996. * ** ***. Are Magnesium sulphate and Carbon dioxide better anaesthetics than benzocaine for commercial abalone culture. Proc. Aquacult. Assoc. sthn. Afr. 5: 94 – 99. (3rd Congress Aquaculture Association of southern Africa, Aquaculture 94, Berg-n-dal, Kruger National Park, September 1994)

HEASMAN, K. & HECHT, T. 1996. * ** ***. Mussel rafts in Saldanha Bay: What mysteries. Proc. Aquacult. Assoc. sthn. Afr. 5: 84 – 86. (3rd Congress Aquaculture Association of southern Africa, Aquaculture 94, Berg-n-dal, Kruger National Park, September 1994)

DEACON, N. & HECHT, T. 1996. * ** ***. Progress in the evaluation of the spotted grunter, Pomadasys commersonnii, as a candidate species for mariculture. Proc. Aquacult. Assoc. sthn. Afr. 5: 74 – 83. (3rd Congress Aquaculture Association of southern Africa, Aquaculture 94, Berg-n-dal, Kruger National Park, September 1994)

HECHT, T. 1995 *. Observations on agonistic behaviour in Pagrus auratus larvae. (International Larval Fish Conference, University of Sydney, Australia, July 1995)

HEASMAN, K., HECHT, T. & MC QUAID, C. 1995. The occurrence and implications of settlement of the sea squirt Ciona intestinalis and mussel spat on commercial mussel rafts in Saldanha Bay. (Joint ZSSA / SASAQS Symposium, Grahamstown, July 1995)

DEACON, N. & HECHT, T. 1995. The effect of feeding frequency on gut evacuation and its implications for food intake and growth of juvenile spotted grunter, Pomadasys commersonnii (Haemulidae: Pisces). (Joint ZSSA/SASAQS Symposium, Grahamstown, July 1995).

WHITE, H., HECHT,T. & POTGIETER, B. 1994. Effect of four anaesthetics on Haliotis midae and the implications for commercial abalone culture. (2nd International Abalone Biology and Culture Symposium, Hobart Tasmania, January 1994)

HECHT, T. 1994 *,**. Alternative life history approaches to nutrition and feeding in siluriform catfish. (International Workshop on the biological bases for aquaculture of Siluriformes, Montpellier, May 1994).

HECHT, T. 1994 *,**. Status and perspectives on catfish culture in Africa. (International Workshop on the biological bases for aquaculture of Siluriformes, Montpellier, May 1994).

GRIFFITHS, M.H. & HECHT, T. 1993 *. Two South African Argyrosomus species: Implications for management. Oceanogr. Res. Inst. Spec. Publ. (2): 19 – 22. (Second National Marine Linefish Symposium, Oceanographic Research Institute, Durban, October 1991)

HECHT, T & BUXTON, C.D. 1993 *. Trends in the Transkei commer¬cial linefishery. Oceanogr. Res. Inst. Spec. Publ. (2): 127 – 133. (Second National Marine Linefish Symposium, Oceanographic Research Institute, Durban, October 1991)

HECHT, T. 1992 *. The culture of Clarias gariepinus in south¬ern Africa, with comments on the relative futility of subsistence aquaculture in Africa. (First World Fisheries Congress, Athens, Greece, May 1992)

OELLERMAN, L. & HECHT, T. 1992 **,***. The aquaculture potential of a catfish hybdrid (Heterobranchus longifilis x Clarias gariepi¬nus) in southern Africa. Proc. Aquacult. Assoc. sthn. Afr. 1: 129 – 134. (Aquaculture ’92, Rhodes University, Grahamstown, September 1992)

KNAUER, J., HECHT, T. & DUNCAN, J.R. 1992 **,***. Development of an artificial weaning diet for the South African abalone, Haliotis midae. Proc. Aquacult. Assoc. sthn. Afr. 1: 161 – 165. (Aquaculture ’92, Rhodes University, Grahamstown, September 1992)

HECHT, T. 1992 **,***. Temperature studies on abalone and the implications for site selection. Proc. Aquacult. Assoc. sthn. Afr. 1: 158 – 160. (Aquaculture ’92, Rhodes University, Grahamstown, September 1992)

HECHT, T. 1992 **,***. The current status of aquaculture in South Africa 1991. Proc. Aquacult. Assoc. sthn. Afr. 1: 17 – 25. (Aquaculture ’92, Rhodes University, Grahamstown, September 1992)

BOUSSIAHN, F., DEACON, N. & HECHT, T. 1992 **,***. Temperature preference and the effect of salinity on the growth of juvenile spotted grunter, Pomadasys commersonnii. (Aquaculture ’92, Rhodes University, Grahamstown, September 1992).

ROUHANI, Q. & HECHT, T. 1992 **,***. Comparative energetics of African catfish and a catfish hybrid (Heterobranchus longifilis x Clarias gariepinus). (Aquaculture ’92, Rhodes University, Grahamstown, September 1992).

HEASMAN, K. & HECHT, T. 1992 **,***. The effect of salinity on food consumption, food conversion, growth and protein conversion efficiency in Oreochromis mossambicus. (Aquaculture ’92, Rhodes University, Grahamstown, September 1992).

HECHT, T. 1991. Behavioural implications in fish larvi culture. (International Council for the Exploration of the Sea Workshop on fish larviculture, Gent, September 1991)

HECHT, T. and PIENAAR, A.G. 1991. Cannibalism: The hidden mortality factor in larviculture. European Aquacult. Soc. Spec. Pub. 15: 277. (LARVI ’91, University of Gent, Belgium, September 1991)

HECHT, T. and BRITZ, P.J. 1991 *. The current status and future prospects of aquaculture in South Africa. In: Proc. Symp. Aqua¬cult. Assoc. of S.A. (ed. R.G.M. Heath), 6 23. (Aquaculture ’90, University of Stellenbosch, July 1990)

HECHT, T. & BRITZ, P.J. 1990. Mariculture in South Africa: Development, environmental implications and future prospects. (Marine, Estuarine and Freshwater Ecosystems Conference, Grahamstown, July 1991)

HECHT,T & McEWAN, A.G. 1992 *,**. Change in gross protein and lipid requirements of rainbow trout at elevated temperatures. Aquaculture 100: 231. (International Rainbow Trout Symposium, University of Stirling, Scotland, September 1990)

HECHT, T. 1990 *. The status of the East Cape linefishery. In: Marine Recreational Fishing: Resource Usage, management and research. Ed. R.P. van der Elst. S. Afr. Nat. Sci. Prog. Rep. 167: 31 38. (First National Marine Linefish Symosium, East London Museum, October 1989)

HECHT, T. 1990 *. Is reseeding a viable linefish management option? In: Marine Recreational Fishing: Resource Usage, manage¬ment and research. Ed. R.P. van der Elst. S. Afr. Nat. Sci. Prog. Rep. 167: 98 102. (First National Marine Linefish Symosium, East London Museum, October 1989)

HECHT,T. 1990 *. Fundamentals of marine linefish research. In: Marine Recreational Fishing: Resource Usage, management and research. Ed. R.P. van der Elst. S. Afr. Nat. Sci. Prog. Rep. 167: 75 81. (First National Marine Linefish Symosium, East London Museum, October 1989)

TILNEY, R.L. & HECHT, T. 1990. Commercial vs. recreational utilisation of the linefish resource: a case study. (7th National Oceanographic Symposium, San Lemeer, June 1990)

GRIFFITHS, M.H. & HECHT, T. 1990. Western boundary current migrations: Their ecological significance and implications for fisheries management. (7th National Oceanographic Symposium, San Lemeer, June 1990)

HECHT, T. 1989 *. Present status of Clarias gariepinus production and research in South Africa. Ecosyst. Prog. Occ. Rep. (37): 10 – 15. (Aquaculture ’86, CSIR Conference Centre, Pretoria, July 1988)

HECHT,T. 1988. Characteristics of the Australian freshwater crayfish, Cherax tenuimanus. In:Walmsley, D. (Ed). An overview of marron farming and its potential in South Africa. NRF, CSIR. Ecosyst. Prog. Occ. Rep. (29): 2 10. (CSIR Ecosystems Workshop on marron culture, Stellenbosch, August 1987)

HECHT, T. & SMALE, M.J. 1987. Age and growth of South African marine linefish: recent perspectives. (6th National Oceanographic Symposium, Stellenbosch, July 1987).

HECHT, T. & TILNEY, R.L. 1987. The Port Alfred Linefishery: functional dynamics and management. (6th National Oceanographic Symposium, Stellenbosch, July 1987).

HECHT, T. 1987 *,***. Cannibalism: An alternative life history style. (International Symposium: Alternative life history styles of fishes and other living organisms, Grahamstown, July 1987).

HECHT, T. 1986 *. Observations on sibling cannibalism in larval and juvenile sharptooth catfish, Clarias gariepinus. Ecosys. Prog. Occ. Rep. Ser. 15: 57 – 58. (Aquaculture ’86, University of Pretoria, July 1986)

HECHT, T. 1984 *. Recent developments in aquaculture in South Africa: the sharptooth catfish. Ecosys. Prog. Occ. Rep. Ser. 1: 33-46. (Aquaculture ’84, Cathedral Peak, July 1984)

HECHT, T. 1984 *. Development of a suitable dry diet for freshwater fish larvae. (Joint Taiwan / South Africa aquaculture symposium, Taipei, October 1984)

HECHT, T. 1984 *. Perspectives on aquaculture in South Africa. (Joint Taiwan / South Africa aquaculture symposium, Taipei, October 1984)

HECHT, T. 1983. An atlas of Antarctic Fish Otoliths. (Fourth International Symposium on Antarctic Biology, Wilderness, September 1983)

HECHT, T. 1982 *. Otoliths; A critical appraisal of their systematic value. (Fourth Congress of European Ichthyologists, Hamburg, September 1982)

—————————————————————————————————————————————–

OTHER RESEARCH PAPERS

The biology and culture of African catfish (Clarias gariepinus) (in collaboration with University of Gent)

Small scale aquaculture in sub-Saharan Africa (in collaboration with University of Gent) Legal aspects of contemporary marine fisheries (with particular emphasis on SADC) (in collaboration with University of Gent) – RSA project leader