Effects of dietary tricalcium phosphate on the growth and mineral availability in Japanese flounder
2000
Hossain, M.A. (Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture) | Furuichi, M.
A 10-week feeding trial was conducted to investigate the effects of dietary tricalcium phosphate (TCP) on growth and mineral availability in juvenile Japanese flounder (Paralichthys olivaceus). A 0.25% Ca supplement from Ca-lactate to the diet (diet 2) significantly increased the growth of fish compared to the basal diet 1 without a Ca supplement. However, a dietary supplement of 2.5% Ca from TCP (diet 3) did not improve the growth and decreased Zn and Mn contents of bone when compared to the basal diet 1. A 0.25% Ca supplement from Ca-lactate to the diet (diet 4), in addition to the 2.5% Ca supplement from TCP, also could not improve the growth and Zn and Mn contents of bone. A Zn supplement to the diet (diet 5), in addition to the 2.5% Ca supplement from TCP, increased the Zn content of bone but did not improve the growth. The present study suggests that dietary TCP introduces decreased growth and low availability of Zn and Mn in Japanese flounder and that easily digestible Ca supplementation to the TCP-riched diet alone can not improve the growth and mineral availability. In a TCP-riched diet (fish meal diet, for example), both easily digestible Ca and higher amounts of Zn and Mn supplements may be necessary for obtaining improved growth and mineral availability in juvenile Japanese flounder
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