Effects of Dietary Lipid Levels on Growth,Survival, and Molting of Yearling Narrow Clawed Crayfish,Astacus leptodactylus |
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| Authors: | Alireza Valipour Rodrigo O. A. Ozorio Farid Shariatmadari Abdolmohammad Abedian Jafar Seyfabadi Asgar Zahmatkesh |
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| Affiliation: | 1. Inland Waters Aquaculture Research Centre , Gilan , Iran valipour32@yahoo.com;3. CIMAR/CIIMAR, Centro Interdisciplinar de Investiga??o Marinha e Ambiental , Universidade do Porto , Porto , Portugal;4. Department of Animal Nutrition, Faculty of Agriculture , Tarbiat Modarres University , Tehran , Iran;5. Department of Fisheries Sciences, Faculty of Natural Resources and Marine Sciences , Tarbiat Modarres University , Tehran , Iran;6. Mirza Koochak-khan Higher Education Center for Fisheries Science and Technology, Industrial city , Rasht , Iran |
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| Abstract: | The influence of dietary lipid level was evaluated on growth, survival, and molting of yearling narrow clawed crayfish, Astacus leptodactylus. Yearling crayfish were fed five isonitrogenous diets (35% protein), formulated to contain 4%, 7%, 10%, 13%, or 16% lipid. Crayfish (10.1 ± 1.6 g) were reared for 56 days in 60-L fiberglass tanks at 23 ± 1.7 °C, with flow-through water and continuous aeration. At the end of the trial, crayfish fed 13% lipid had the highest weight gain and specific growth rate, significantly different from crayfish fed 4% and 7% lipid (p < 0.05). Crayfish fed 13% lipid had a significantly higher survival rate (86.7%) than the animals fed 4% lipid (71%) (p < 0.05). Molting was not affected by lipid level (p > 0.05). We recommend 13% dietary lipid level for optimum growth and survival of Astacus leptodactylus in intensive cultivation. |
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| Keywords: | Narrow clawed crayfish Astacus leptodactylus lipid nutrition growth survival molting |
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