The fate of lipids during development and cold-storage of eggs in the laboratory-reared calanoid copepod, Acartia tonsa Dana, and in response to different algal diets
1999
Stottrup, J.G. | Bell, J.G. | Sargent, J.R.
The calanoid copepod Acartia tonsa was sampled throughout one generation to examine the fate of lipids during development in culture. Effects of dietary input were examined by feeding A. tonsa for at least one generation with specific monoalgal cultures. Four different algae were tested: the cryptophyte Rhodomonas baltica, the haptophyte Isochrysis galbana clone T-iso, the diatom Thalassiosira weissflogii and the dinoflagellate Heterocapsa triquetra. Further, the effect of cold storage of eggs on the lipid composition of the newly hatched nauplii was examined. During development, the fatty acid composition changes from a tendency towards high levels of long-chain polyunsaturated fatty acids in the early developmental stages towards a tendency to accumulate more saturated and monounsaturated fatty acids in the later developmental stages. However, the content and composition of polyunsaturated fatty acids can be influenced by the dietary input. The highest ratio of 22:6n-3/20:5n-3 was achieved using H. triquetra or I. galbana. Higher levels of 20:5n - 3 were achieved by feeding with R. baltica or T. weissflogii. I. galbana and T. weissflogii were particularly suitable for increasing levels of arachidonic acid (20:4n-6; AA) in A. tonsa.
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