Effects of dietary phosphorus supplementation on growth and excretion of nitrogen and phosphorus by growing yellowtail Seriola quinqueradiata
2009
Sarker, Md.S.A.(Tokyo Univ. of Marine Science and Technology (Japan)) | Satoh, S. | Yamamoto, Y. | Satoh, K. | Kiron, V.
The effects of dietary phosphorus (P) supplementation on growth and excretion of nitrogen (N) and P was investigated in growing yellowtail fed fishmeal (FM) based practical diets. This study was conducted under on-site conditions for 12 months with the intention of developing a less-polluting feed. Three diets were formulated to contain 13, 15, and 17 mg P/g diet by supplementing 0, 0.8 and 1.6% mono calcium phosphate. Each net cage of yellowtail (120 at start, 60 at termination) was fed the diets for 12 months during which the fish grew from approximately 885 to 3200 g, at an average water temperature of 20.6degC. The P supplemented diets gave slightly better growth performance compared to the control (no additional P) diet. These diets also gave the better feed conversion ratios. However, the inorganic P supplementation caused a reduction in both N and P retention that led to increased amounts being excreted. The results of the present study demonstrate that it is not necessary to add P to FM-based diet for growing yellowtail. When put into practice, such diets would enable a reduction in loading of P and N from fish in aquaculture.
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