Collected reprints: Abstract 2928
Collected reprints
Abstract
Coutteau, P.; Caers, M.; Curé, K.; Gajardo, G. (1996). Supplementation of lipid emulsions to algal diets in the hatchery rearing of bivalves. Improvement of the Commercial Production of Marine Aquaculture Species : 145-154
The success of hatchery production of bivalves remains highly unpredictable and mortalities are often attributed to deficiencies in certain nutritionally important components. Several studies have implicated the importance of lipids, in particular triglycerides, in the early life stages as a source of energy and essential fatty acids. Experimental diets used so far in bivalve nutrition studies are either heavily polluting the water or too complex to prepare on a regular basis in a hatchery. Self emulsifying concentrates of marine oils are off-the-shell lipid supplements that may be acceptable for bivalves. A series of studies were performed with different species and life stages to evaluate the potential use of these lipid emulsions as a supplement for hatchery rearing of bivalves. Experiments considered lipid supplementation in larvae of the European oyster Ostrea edulis and the hard clam Mercenaria mercenaria, juveniles of the sea scallop Placopecten magellanicus, and broodstock of the Chilean scallop Argopecten purpuratus. Ingestion and incorporation of the fatty acids supplied through lipid emulsions were verified analytically for juvenile P. magellanicus and larvae of O. edulis. Culture trials with M. mercenaria showed better growth and survival throughout metamorphosis for larvae receiving a 50% (of algal dry weight) DHA-rich supplement compared to the controls fed solely on Isochrysis sp. (clone T-Iso). Initial results are presented on the use of the lipid emulsion during broodstock conditioning of A. purpuratus. Supplementation of lipid emulsions that are rich in essential fatty acids may contribute to improve or standardize dietary supply of lipids and fatty acids in hatchery production of various bivalve species.
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