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Digestive Enzymatic and Nucleic Acidic Responses of Olive Flounder Paralichthys oilivaceus Larvae Fed Cyclopoid Copepod Paracyclopina nana  

Kwon, O-Nam (Graduate School of Fisheries Science, Hokkaido University)
Lee, Kyun-Woo (Department of Chemistry, Hanyang University)
Kim, Gun-Up (Gangwon Province Fisheries Resource Institute)
Park, Heum-Gi (Faculty of Marine Bioscience & Technology, Kangnung National University)
Publication Information
Journal of Aquaculture / v.21, no.3, 2008 , pp. 190-195 More about this Journal
Abstract
We investigated the changes in growth, digestive enzymes activities, nucleic acids contents and RNA/DNA ratio of flounder Paralichthys olivaceus larvae (C for Paracyclopina nana, A for Artemia, and M for Mix of C and A) for 14 to 28 DAH. Body length of flounder larvae showed the best in the C trial at 28 DAH. The change of nucleic acids contents showed faster in C and M trials than A trial. And RNA/DNA ratio showed the significantly faster changes in C trial than A trial. High metamorphosis rates were also observed in C and M trial. $\alpha$-amylase activities increased gradually up to 28 DAH in all trials. Total alkaline protease (TAP) activities of A trial showed the highest value to 9 mU/larvae at 26 DAH. But others trials showed lower to $5{\sim}6$ mU/larva than A trial. TAP:$\alpha$-amylase activity ratio did not significantly changed to $0.025{\sim}0.053$ in A trial during the experiments. But, C and M trials tended to gradually decrease from $0.078{\sim}0.083$ (initial) to $0.013{\sim}0.018$ (final). Therefore, it shown the ratio gradually decreased of TAP:$\alpha$-amylase activity, stability of TAP activity, and rapid change of nucleic acids in trials grown positively. Thus, because P. nana could continuously supply the optimal nutrients for flounder larvae, we suggested the supplement of the copepod to an efficient feed of the flounder larvae.
Keywords
Paralichthys olivaceus larvae; Paracyclopina nana; Artemia; Digestive enzyme; Nucleic acids; Total alkaline protease:$\alpha$-amylase ratio;
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