Evaluation of growth and bioaccumulation of cobalt in different tissues of common carp, Cyprinus carpio (Actinopterygii: Cypriniformes: Cyprinidae), fed cobalt-supplemented diets
2009
Mukherjee, S. | Kaviraj, A.,University of Kalyani, Kalyani WB (India). Dept of Zoology
Cobalt (Co) is an essential mineral required in trace quantity in the diet of fish. Two separate trials were made with fingerlings of common carp, Cyprinus carpio: a growth trial made in outdoor cement tanks for 60 days and a digestibility trial made in 15-L glass aquaria in the laboratory for 7 days. Four experimental diets (average crude protein 30.94 percent) supplemented by four different levels of Co (0.00 percent, 0.05 percent, 0.10 percent, and 1.0 percent) were formulated and tested in these two trials. Growth from gain in weight, specific growth rate, feed conversion ratio, and deposition of protein and lipid in the body of the fish were evaluated. Fingerlings of C. carpio fed 0.1 percent to 1.0 percent cobalt-supplemented diet (CSD) showed significantly higher growth than the control diet. Increased growth with no additional tissue burden of Co is achieved at 0.1 percent dietary Co, while a higher level of supplement (1.0 percent) may result in increased deposition of Co in different tissues
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