期刊
AQUACULTURE RESEARCH
卷 40, 期 2, 页码 225-232出版社
WILEY
DOI: 10.1111/j.1365-2109.2008.02086.x
关键词
phosphorus; aquaculture effluent; requirement; non-faecal; yellowtail
类别
资金
- Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Fisheries Agency of Japan
Non-faecal phosphorus (P) was determined for large yellowtail to estimate a minimum available P requirement (Experiment 1) and to justify inorganic P supplementation in a fish meal-based diet (Experiment 2). In Experiment 1, purified diets with incremental P concentrations were fed to yellowtail (mean weight 917 g) at a feeding rate of 1.5% of body weight. The peaks of non-faecal P excretion appeared 5-6 h after feeding in fish fed more than 4.5 g available P kg(-1) dry diet. Broken-line analysis indicated that the minimum available P requirement was 4.4 g kg(-1) dry diet. In Experiment 2, a purified diet (PR) containing 6.5 g available P kg(-1) and a fish meal-based diet with (F1) and without (F0) additional phosphorus were fed to yellowtail (mean weight 1.1 kg) at 1.5% (PR) and 2% (F0 and F1) feeding rates respectively. There was no significant difference in P excretion between fish fed the F0 (5.5 g soluble P kg(-1) dry diet) and the PR diet. However, significantly higher (34.5%) amounts of non-faecal P excretions (7.4 g soluble P kg(-1) dry diet) were found in fish fed F1 compared with the F0 diet. This suggested that there was an excess of dietary P in the F1 diet and that supplementation is not needed in fish meal-based diets for large yellowtail.
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