Essentiality of dietary calcium supplement in redlip mullet Liza haematocheila |
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Authors: | Hossain & Furuichi |
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Institution: | Fishery Research Laboratory, Kyushu University, Tsuyazaki, Fukuoka, Japan |
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Abstract: | This study was conducted to determine the essentiality of dietary calcium supplement to redlip mullet Liza haematocheila . Juvenile fish were fed four purified experimental diets containing 2.0 g kg–1 Ca from calcium lactate (diet 1), no supplemental Ca (diet 2), and 2.0 g and 25.0 g kg–1 Ca from tricalcium phosphate (TCP, diets 3 and 4), respectively. At the end of the 10-week experiment, growth was significantly lower in fish fed diet 2 than fish fed all other diets. This suggests that redlip mullet do not obtain adequate Ca from sea water. Fish fed diets 3 and 4 showed growth performances similar to fish fed diet 1. However, dietary TCP negatively affected bone mineralization of Zn, Mn, K and Fe. The Ca, Zn and Fe levels in liver were low in fish fed TCP-supplemented diets. From these findings, it may be concluded that a dietary Ca supplement is necessary for redlip mullet. Although this species can use dietary TCP as a Ca source for growth, an easily digestible Ca (monobasic or dibasic) supplement to a TCP-rich diet is also essential to maintain normal mineral levels in tissues. |
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Keywords: | bone mineralization calcium feed utilization growth redlip mullet tricalcium phosphate |
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