Abstract
A long-term feeding experiment (83 weeks) was conducted to examine the effect of the deletion of each trace element (Zn, Mn, Cu, Co) or magnesium (Mg) from the mineral mixture in white fish meal diets on growth and mineral composition of common carp. The deletion of Mn from the fish meal diet caused cataracts (70%) together with short body dwarfism (90%) and depressed growth. These results were found to be very similar to those obtained in the fish receiving the diet without a supplement of any trace elements. The deletion of the other elements from the diets also resulted in cataracts (40-70%) and reduced growth. On the other hand, short dody dwarfism was not induced by the deletion of Zn from the fish meal diet, quite different from the case of rainbow trout. The deletion of Mn resulted in reduced levels of crude ash, Ca, Mg, P, and Mn in vertebrae. Furthermore, the content of Mn in vertebrae of carp was found to be significantly lower than that of rainbow trout. These results have shown that the supplement of dietary Zn, Mn, Cu and Mg to fish meal diets are each essential for common carp.
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