The effects of dietary fatty acids on the fatty acid composition of the harpacticoid copepod, Tisbe sp., for use as a live food for marine fish larvae
1998
The marine harpacticoid copepod Tisbe sp. was isolated from plankton collected near Halifax, Nova Scotia and raised in the laboratory for over 20 generations. The effects of feeding various algal (Chaetocerus calcitrans, Dunaliella tertiolecta, and Isochrysis galbana) and baker's yeast diets on the nutritional value, or essential fatty acid (EFA) composition, of the copepod for use as an alternative live food for cold-water marine finfish larvae was evaluated in this study. The copepod was able to synthesize a significant amount of the EFA's, 20:5n-3 (EPA) and 22:6n-3 (DHA) from shorter chain n-3 polyunsaturated fatty acids, when fed the algae D. tertiolecta (6.2% EPA, 12.4% DHA) or baker's yeast (12.4% EPA, 28.4% DHA) which are deficient in these EFA's. The copepod also maintained a consistently high DHA:EPA ratio (> 2) when fed each of the dietary treatments.
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