Dietary Chlosterol Requirement of Juvenile Narrow-clawed Crayfish (Astacus leptodactylus) in a Recirculating Aquaculture System
نویسندگان
چکیده مقاله:
Dietary cholesterol has been shown to be essential for several crustacean species. However, cholesterol requirement of narrow-clawed crayfish has not been reported. Therefore, a 12-week feeding trial was conducted to determine deitary cholesterol requirement of narrow-clawed crayfish. Juvenile crayfish with an average body weight of 13.8±1 g mean weight were intensively stocked in an indoor recirculating aquaculture system consisting of 12 rectangular fiberglass tanks with 10% daily water exchange under constant aeration and PVC shelters. Water was recirculated through biological and mechanical filters. Four experimental diets with 30% crude protein and 10% crude lipid were formulated to contain graded levels of dietary cholesterol (0, 0.25, 0.5 and 0.75 % Cholesterol). Casein and gelatin were used as primary sources of dietary protein in experimental diets. Our results showed crayfish fed diet with 0.5 and 0.0 % cholesterol level produced the highest and lowest growth indices, survival rate and enzymes activity including protease, lipase and amylase, respectively significant (P<0.05). With increase of cholesterol content of experimental diet (0.75 %) crayfish survival rate and lipase activity siginificantly decreased, however, no significant differences were observed regarding growth indices, protease and amylase activity (P>0.05). In conclusion, the results indicated that dietary inclusion of 0.5% cholesterol would improve growth performance and digestive enzymes activity of juvenile narrow-clawe crayfish reared under intensive condition.
منابع مشابه
Growth, Molting and Survival Response of Juvenile Narrow Clawed Crayfish, Astacus leptodactylus, Fed Two Sources of Dietary Oils
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The influence of five pure diets of isonitrogenous and isoenergic with different ratios of Clupeidae fish oil (F) and soybean oil (S) on growth, molting and survival of narrow-clawed crayfish, Astacus leptodactylus, was evaluated during an 8-weeks trial. As soybean oil replaced with fish oil in each treatment, gently. Test diets were inclusive F0/S100, F30/S70, F50/S50, F70/S30 and F100/S0 fis...
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متن کامل
Evaluation of different dietary protein and energy levels on growth performance and body composition of narrow clawed crayfish (Astacus leptodactylus)
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عنوان ژورنال
دوره 11 شماره 42
صفحات 70- 0
تاریخ انتشار 2020-06
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