期刊
AQUACULTURE
卷 212, 期 1-4, 页码 321-333出版社
ELSEVIER
DOI: 10.1016/S0044-8486(02)00039-X
关键词
phosphorus requirement; low-pollution diets; nutrient deficiency
Trials were conducted to determine the dietary phosphorus (P) requirement of European whitefish, and to assess the effects of sub-optimal P feeding on growth, bone mineralization, lipid accumulation in the body and on heat and low-oxygen tolerance. Four replicate groups of whitefish fingerlings were fed in excess with one of five semipurified diets containing 4.4 to 14.9 g P kg(-1). The P requirement was estimated by nonlinear curve fitting to bone mineralization and growth rate data. Dietary P and energy availabilities were measured at the determined requirement level. Fish fed no P supplement showed typical hypophosphatemia in poorly mineralized bones, a low whole-body P content and a low plasma phosphate concentration. Hypophosphatemic fish grew slower and had elevated whole body lipid concentrations. To obtain 95% of the maximum vertebra ash concentration and maximum growth, respectively, 6.5- and 6.2-g available P kg(-1) diet was required. Fish fed low dietary P contents had higher whole body lipid levels than fish fed P at or above the determined requirement level. Hypophosphatemic fish had slightly, although statistically significant, lower upper lethal temperature than fish fed with adequate P contents (28.8 vs. 29.4 degreesC). Tolerance of low dissolved oxygen did not differ between fish fed low or high P contents (1.47 vs. 1.45 mg l(-1)) (C) 2002 Elsevier Science B.V. All rights reserved.
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