Abstract：Effects of three dietary ingredients (i.e. kelp Laminaria japonica powder, Sargassum thunbergii powder and commercial feed for sea cucumber Apostichopus japonicas) on growth rate and fatty acid (FA) of giant red sea cucumber Parastichopus californicu were evaluated, to screen the optimal diet ingredients for giant red sea cucumber. The results showed that FA compositions in giant red sea cucumber were significantly different among three dietary groups (P<0.05). The contents of n-6 and n-3 polyunsaturated fatty acid (PUFA) groups in giant red sea cucumber were positively correlated with dietary contents of 18:2n-6 and 18:3n-6, indicating that giant red sea cucumber had the ability to biosynthesize long chain n-6 and n-3 PUFAs. Giant red sea cucumber fed kelp displayed the highest growth rate and PUFA content among three dietary groups (P<0.05). However, giant red sea cucumber fed commercial feed showed the highest n-3 fatty acid content and n-3 PUFAs/n-6 PUFAs (P<0.05). From the aspect of specific growth rate and fatty acid composition, kelp is more suitable than S. thunbergii to feed giant red sea cucumber. In conclusion, the mixed feed containing kelp and higher n-3 fatty acid is supposed to provide more balanced nutrition for giant red sea cucumber.
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2022, Vol. 41 
