Studies on the nutritional requirements of the larval stages of Penaeus japonicus using microencapsulated diets |
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Authors: | Jones D A Kanazawa A Ono K |
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Institution: | (1) Marine Science Laboratories, Department of Marine Biology, LL59 5EH Menai Bridge, Gwynedd, North Wales, UK;(2) Faculty of Fisheries, University of Kagoshima, 4-50-20 Shimoarata, Kagoshima, Japan |
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Abstract: | Fatty acid biosynthesis in the larval stages of Penaeus japonicus Bate was examined by feeding microencapsulated diets containing (1-14C) palmitic acid, and fat-free diets supplemented with defined fatty acids. Highest larval growth rates were achieved on diets containing Tapes philippinarum lipid and, when defined fatty acids were substituted, on diets containing 20:6 3 fatty acid. The radioactive tracer experiments indicate that 16:1 7, 18:0 and 18:1 9 fatty acids may be synthesised from palmitic acid and that P. japonicus larvae may possess the ability to elongate 18:3 3 to 20:5 3 and 22:6 3, and 18:2 6 to 20:4 6. However, the rates of these reactions appear to be too slow to meet the larval requirements for essential fatty acids and the 3 series of polyunsaturated fatty acids must be provided in the diet. |
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