Author(s): Anisuzzaman MD, U-Cheol Jeong, Feng Jin, Kamrunnahar Kabery, Jong- Kuk Choi, Da-In Lee, Hak Sun Yu and Seok-Joong Kang

Abstract: Two experiments were conducted to investigate the effects of Ulva lactuca and Laminaria japonica algae in diets on growth, survival, fatty acid compositions and interleukin-10 productions of sea cucumber. In the first experiment, 56 days feeding trail was conducted to evaluate the growth performance, survival and fatty acid compositions of the sea cucumber fed one of the four experimental diets containing diet 1 (Control diet), diet 2 (Ulva lactuca), diet 3 (Laminaria japonica) and diet 4 (Ulva lactuca + Laminaria japonica) in recirculating aquaculture system. Results showed that survival was not significantly different among the dietary treatments and specific growth rate (SGR) of sea cucumber fed the diet 3 (1.82 % d-1) was significantly higher than that of sea cucumber fed the other diets (P < 0.05). Fatty acids content of sea cucumber were significantly different among the diet groups. The highest amount of eicosapentaenoic acid, docosahexaenoic acid, palmitoleic acid and branched chain fatty acids were found when sea cucumber fed diet 3. The second experiment was conducted to determine IL-10 gene expression where mice splenocytes were stimulated with 10 µg/ml of each diet fed sea cucumber extracts for 2 hours. The result showed that IL-10 gene expression levels were significantly higher in diet 3 fed sea cucumber extracts compared to other experimental diets. The results of two experiments suggest that dietary inclusion with 14% Laminaria japonica algae may improve growth, n-3 polyunsaturated fatty acids, branched chain fatty acids of juvenile sea cucumber and could up-regulate of IL-10 gene expression.

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