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Fatty Acid Composition and Digestive Enzyme Activities of Rainbow Trout in Response to Dietary Docosahexaenoic Acid(DHA)and Eicosapentaenoic Acid(EPA)During Salinity Acclimation

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Journal of Ocean University of China 2020年第6期19卷 1430-1440页

作者： HUANG Ming ZHOU Yangen GE Jian AGUSTSSON Thorleifur LI Li GAO Qinfeng DONG Shuanglin Key Laboratory of Mariculture(Ocean University of China) Ministry of EducationQingdao 266100China NORCE Norwegian Research Center Mekjarvik 124072RandabergNorway rorum brynjolfsgata 5 107ReykjavikIceland Function Laboratory for Marine Fisheries Science and Food Production Processes Qingdao National Laboratory for Marine Science and TechnologyQingdao 266235China

This physiological study aimed to evaluate the effects of dietary docosahexaenoic acid(DHA)and eicosapentaenoic acid(EPA)on the fatty acid composition and digestive enzyme activities of rainbow trout(Oncorhynchus mykiss)during salinity *** trout with an average initial weight of 90.61 g±9.25 g were fed diets with the quantities of DHA and EPA equaling to 0.54%,0.95%,1.40%and 1.79%(abbreviated as DE-0.54,DE-0.95,DE-1.40,and DE-1.79,respectively)for eight weeks,after which the gastric and intestinal fatty acids composition were ***,the fish underwent salinity *** days 1,4,7,and 14 after the freshwater was replaced by seawater and at the end of the 8-week period,gastric and intestinal digestive enzyme activities were *** results showed that the gastric and intestinal DHA and EPA contents of the fish were positively correlated to their dietary DHA and EPA *** dietary DHA and EPA levels inhibited the protease activity of rainbow *** in the DE-0.54 group increased the lipase activity to enhance the utilization of lipids maybe due to the inadequate essential fatty acids for fish in this ***,rainbow trout in the DE-0.54 group failed to maintain suitable activities of digestive enzymes after salinity ***,a diet with minimum 0.95%DHA and EPA levels is necessary for rainbow trout during salinity acclimation.

关键词： digestive enzymes docosahexaenoic acid eicosapentaenoic acid rainbow trout

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