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Manipulated yeast diets and dried algae as a partial substitute for live algae in the juvenile rearing of the Manila clam Tapes philippinarum and the Pacific oyster Crassostrea gigas
Coutteau, P.; Dravers, M.; Dravers, P.; Léger, P.; Sorgeloos, P. (1993). Manipulated yeast diets and dried algae as a partial substitute for live algae in the juvenile rearing of the Manila clam Tapes philippinarum and the Pacific oyster Crassostrea gigas, in: Barnabé, G. et al. (Ed.) Production, environment and quality: Proceedings of the International Conference Bordeaux Aquaculture '92, Bordeaux, France, March 25-27, 1992. EAS Special Publication, 18: pp. 523-531
In: Barnabé, G.; Kestemont, P. (Ed.) (1993). Production, environment and quality: Proceedings of the International Conference Bordeaux Aquaculture '92, Bordeaux, France, March 25-27, 1992. Special Publication European Aquaculture Society, 18. European Aquaculture Society: Gent. 587 pp., meer
In: Special Publication European Aquaculture Society. European Aquaculture Society: Bredene. ISSN 0774-0689, meer
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  • Coutteau, P., meer
  • Dravers, M.
  • Dravers, P.
  • Léger, P.
  • Sorgeloos, P., meer
Abstract
    The development of a cost-effective artificial diet would greatly reduce the operating costs and improve the efficiency of bivalve seed production. The present study documents the use of a manipulated yeast diet and dried algae (Tetraselmis suecica, Cyclotella cryptica) as an 80% substitute for live algae under the conditions of a commercial bivalve hatchery. Juveniles of the Manila clam T. philippinarum and of the Pacific oyster C. gigas were grown in a 28l recirculating system for three weeks. In addition, a preliminary flow-through culture test was performed with C. gigas. Supplementing manipulated yeasts improved the growth rate of juvenile clams and oysters fed 20% of the algal ration from 30-40% to 70-80% of that observed for the algae-fed controls over a period of 3 weeks. The yeast diet supported similar clam growth as the dried T. suecica and better oyster growth than the dried C. cryptica. Substituting 80% of the algal ration by either the yeast diet or dried T. suecica in the flow-through experiment with C. gigas resulted in a growth rate exceeding 90% of that observed for the algae-fed controls during the first week of the experiment. During the second week of the test this relative growth rate was only maintained by oysters fed the 20/80% algae/dried T. suecica diet. Further research is needed to define the optimal food levels of the yeast diets in continuous flow cultures.
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