Effects of seawater potassium concentration on the dietary potassium requirement of Litopenaeus vannamei

文献类型： 外文期刊

第一作者： Zhu, Chang-Bo

作者： Zhu, Chang-Bo;Dong, Shuang-Lin;Wang, Fang;Zhang, Han-Hua

作者机构：

关键词： potassium;dietary requirement;Litopenaeus vannamei;inland;growth

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

ISSN： 0044-8486

年卷期： 2006 年 258 卷 1-4 期

页码：

收录情况： SCI

摘要： Effects of seawater potassium concentration on the dietary potassium requirement of Litopenaeus vannamei were studied under the condition of artificial seawater at salinity 30 parts per thousand. Three potassium concentrations in the water were set: 332, 156 and 104 mg l(-1). And the potassium contents of the casein-gelatin-based experimental diets were 1.09%, 1.53%, 2.49% and 3.46%, respectively. The feeding trial lasted for 56 days. Growth, feeding, nutrient retention and feed conversion efficiency of the shrimp were significantly affected by the potassium concentration in the seawater (P < 0.05), but the dietary potassium levels showed little effect The final body weight, specific growth rate, protein efficiency ratio and feed conversion efficiency of shrimp exposed to 104 mg F 1 water potassium level were, respectively, more than 37%, 26%, 25% and 27.5% lower than of those exposed to higher water potassium levels (P < 0.05). No significant interaction effects were found between seawater potassium concentration and dietary potassium level. Neither seawater potassium concentrations nor dietary potassium levels influenced the body potassium content. It indicated that L. vannamei may have poor ability of assimilating potassium from dietary sources efficiently at salinity 30 parts per thousand, and dietary supplementation of potassium had limited effect on improving growth of the shrimp while environmental potassium was sufficient. (c) 2006 Elsevier B.V. All rights reserved.

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