Effect of dietary supplementation of citric acid and amino acid-chelated trace elements on growth and excretion of nitrogen and phosphorus in young yellowtail, Seriola quinqueradiata
2009
Sarker, Md.S.A.(Tokyo Univ. of Marine Science and Technology (Japan)) | Satoh, S. | Matsumoto, S. | Sasaki, S. | Miyashita, H. | Kiron, V. | Yamamoto, Y. | Miyazaki, T.
Two experiments were conducted to investigate the effects of dietary supplementation of citric acid (CA) and amino acid-chelated trace element (AA-CTE) on growth and excretion of nitrogen and phosphorus in yellowtail fed diets including alternate plant protein sources. This study was conducted under on-site conditions and the test diets contained fishmeal 30-35%, defatted soybean meal 10%, and corn gluten meal 14%. Each net cage of 200 yellowtails was fed one of the diets for 4 months at average water temperature 21degC. The fishmeal-based diet gave the best growth while the alternate proteins diet the lowest. However, the growth of fish increased in CA or AA-CTE supplemented groups demonstrating that their addition to low phosphorus containing plant protein diet improved fish growth and reduced phosphorus excretion. Hence, the use of these compounds in young yellowtail diets can help to partially replace fishmeal with plant protein ingredients and this in turn would enable a reduction in environmental pollution from aquafeeds.
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