The effect of a microencapsulated fatty acid diet on larval production in the European flat oyster Ostrea edulis L.
Lane, A. (1989). The effect of a microencapsulated fatty acid diet on larval production in the European flat oyster Ostrea edulis L., in: De Pauw, N. et al. (Ed.) Aquaculture: a biotechnology in progress: volume 1. pp. 657-664
In: De Pauw, N. et al. (1989). Aquaculture: a biotechnology in progress: volume 1. European Aquaculture Society: Bredene. ISBN 90-71625-03-6. 1-592 pp., meer
Broodstock oysters were either unfed or fed for 105 days with a) a high-lipid microencapsulated diet, b) the microalga Pavlova lutheri (Droop), or c) a 50% (w/w) mixture of the two. Unfed oysters produced three broods of normal larvae; those fed diet (a), one brood, and diets (b) and (c), four broods each, although significantly more larvae (P<0.05) were produced from oysters fed diet (c) than (b). The number of larvae per brood decreased with time. In all groups, the total tissue dry weight decreased, and although the proportion of total lipid remained constant, the percentage fatty acid composition changed with diet. In non-gonad total lipid, there was a loss of monounsaturated fatty acids (MUFA) in oysters fed diets (a) and (b), but only a loss of palmitic acid in those fed diet (c). In both gonad and non-gonad total lipid, the polyunsaturated fatty acids (PUFA) 20:4ω6 and 20:4ω3 increased in all fed groups with a major increase in rO2 PUFA (20:5ω3 and 22:6ω3) in gonad total lipid. The increase in ω3 and ω6 PUFA are attributed to dietary linoleic and linolenic acids. The results show that a mixture of the microcapsules and P. lutheri is at least as suitable as the algae alone for conditioning broodstocks of 0. edulis.
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