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Effect of algal ration and substitution of algae by manipulated yeast diets on the growth of juvenile Mercenaria mercenaria Coutteau, P.; Hadley, N.H.; Manzi, J.J.; Sorgeloos, P. (1994). Effect of algal ration and substitution of algae by manipulated yeast diets on the growth of juvenile Mercenaria mercenaria. Aquaculture 120(1-2): 135-150. https://dx.doi.org/10.1016/0044-8486(94)90229-1 In: Aquaculture. Elsevier: Amsterdam; London; New York; Oxford; Tokyo. ISSN 0044-8486; e-ISSN 1873-5622

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 113459 [ download pdf ]

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Trefwoorden

Algae Aquaculture techniques Aquatic organisms > Food organisms Cultures > Shellfish culture > Mollusc culture > Clam culture Diets Microorganisms > Yeasts Population functions > Growth Mercenaria mercenaria (Linnaeus, 1758) [WoRMS] Marien/Kust

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Auteurs		Top
Coutteau, P. Hadley, N.H. Manzi, J.J. Sorgeloos, P.

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Abstract

The development of a cost-effective algal substitute would greatly reduce the operating costs of bivalve hatcheries. Previous work has resulted in the development of a yeast diet with improved digestibility and nutritional composition. The use of this yeast product as a partial algal substitute for the culture of juvenile hard clams Mercenaria mercenaria was investigated in a series of growth experiments. Juveniles of the hard clam (1 mg live weight) were batch cultured in a 1 8 1 recirculating system for 2 or 3 weeks. The optimal weight-specific daily ration for a mixture (50/50 on dry weight basis) of Isochrysis galbana (clone T-Iso) and Chaetoceros gracilis was found to be 1.5 to 2% dry weight per wet weight of seed. Replacing 50% of the algal ration by yeast did not result in a significant decrease in growth rate relative to the algal-fed controls. The substitution of 80% of the algal diet resulted in growth rates reaching 90% compared with those obtained for the algal-fed controls. The incorporation in the yeast diet of fat-soluble vitamins, rice starch, or an extract from macro-algae did not improve its nutritional value. However, the addition of kaolin occasionally resulted in a significantly higher growth rate. The present results are compared with previous reports on the use of yeasts for nursery rearing of bivalves.

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