Abstract
Using monospecific diets of Thalassiosira pseudonana cells grown under different steady-state conditions, it was determined that higher growth rates of larval Crassostrea gigas Thunberg were obtained when fed T. pseudonana cells grown under high light. High light grown T. pseudonana cells consistently contained relatively more of the saturated fatty acids 14:0 and 16:0. Considered over three independent experiments, high light grown T. pseudonana cells were lower in protein and higher in carbohydrate than low light grown cells. Higher growth rates of larval C. gigas were obtained on diets with more of the essential fatty acid (EFA) 22:6ω3, and less of the other EFA, 20:5ω3. The relative requirements of C. gigas larvae for the essential fatty acids 20:5ω3 and 22:6ω3 are discussed. Faster growing larvae contained higher percentages of the fatty acids 14:0 and 16:0, and lower percentages of 22:2j. Oyster growth rates were correlated with their content of the fatty acids: 14:0, 16:0 and 22:2j in two experiments utilizing separately spawned batches of larvae. Fatty acid profiles are proposed as a technique for assessing larval condition. C. gigas larvae contained ten times the percent composition of the FAs 16:4ω3, 18:1ω7, 20:1ω7 and 22:2j compared with their diet. Correlation analysis suggests that the dietary source of 18:1ω7, 20:1ω7 and 22:2j was 16:1ω7. It is concluded that T. pseudonana cells grown under high light are a superior diet for C. gigas larvae in comparison with low light grown cells of the same species.
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Communicated by R. O'Dor, Halifax
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Thompson, P.A., Harrison, P.J. Effects of monospecific algal diets of varying biochemical composition on the growth and survival of Pacific oyster (Crassostrea gigas) larvae. Marine Biology 113, 645–654 (1992). https://doi.org/10.1007/BF00349708
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DOI: https://doi.org/10.1007/BF00349708