Dietary phosphorus requirement of large yellow croaker, Pseudosciaena crocea R

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• 作者：Kangsen Mai ; Chunxiao Zhang ; Qinghui Ai ; Qingyuan Duan ; Wei Xu ; Lu Zhang ; Zhiguo Liufu and Beiping Tan
• 关键词：Fish ; Large yellow croaker ; Pseudosciaena crocea ; Phosphorus requirement ; Feeding and nutrition
• 刊名：Aquaculture
• 出版年：2006
• 出版时间：28 February 2006
• 年：2006
• 卷：251
• 期：2-4
• 页码：346-353
• 全文大小：123 K

文摘

A study was conducted to estimate the optimum requirement of dietary phosphorus for large yellow croaker in floating sea cages (1.0 × 1.0 × 1.5 m). Five practical diets were formulated to contain graded levels (0.30 % , 0.55 % , 0.69 % , 0.91 % and 1.16 % ) of available phosphorus from dietary ingredients and monocalcium phosphate (MCP). Each diet was randomly assigned to triplicate groups of 180 juvenile fish (initial body weight, 1.88 ± 0.02 g). Fish were fed twice daily (5:00 and 17:00) to satiation for 8 weeks. During the experimental period, the water temperature fluctuated from 26.5 to 32.5 °C, salinity from 32‰ to 36‰ and dissolved oxygen was more than 7 mg l^{− 1}. Specific growth rate (SGR) significantly increased with increasing available phosphorus from 0.30 % to 0.69 % of diet (P < 0.05), and then leveled off. The body composition analysis showed that the whole-body ash and lipid, as well as phosphorus content in the whole body, vertebrae and scales were significantly affected by dietary available phosphorus level (P < 0.05). Broken-line analysis based on SGR indicated the minimum available phosphorus requirement for the optimal growth of large yellow croaker was 0.70 % . Based on the phosphorus content in either vertebrae or whole body, the requirements were 0.89 % and 0.91 % , respectively.