Abstract:

The total lipid content in Artemia franciscana (21-23% of dry weight (DW)) when enriched with either Super Selco or DHA Selco was twice as high as in the adult copepods Temora longicornis and Eurytemora sp. (9-11% of DW). In Brachionus plicatilis the total lipid content was 11 and 6.6% for cultures growing at high and low growth rate, 0.12/d and 0.38/d, respectively. In the copepodid stages I, II and III of Calanus finmarchicus the total lipid level was 12-13%, increasing to 24% in copepodid stage IV, V and the adults. In T. longicornis and Eurytemora sp. the predominant fatty acids were DHA (22:6n-3), EPA (20:5n-3) and the saturated fatty acid 16:0, which constituted 40-45%, 21-24% and 8-12% of total fatty acids, respectively. C. finmarchicus contained the same dominant fatty acids. In both the cultivated live feed organisms DNA, EPA and 18:1 were the predominant fatty acids. In A. franciscana the content of these fatty acids varied according to the enrichment medium and in B. plicatilis according to the growth rate.
(SINTEF, Appl. Chem., Ctr. Aquaculture, N-7034 Trondheim, Norway)
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