Abstract
Significant differences in Zn and Cu content were found between different organs. Zinc reaches its maximum, mean value (929 μg/g dry wt), in the kidney of the common carp and consistently has a high value (276–552 μg/g dry wt) in the ovary of all the species examined; Cu is at its maximum (21 μg/g dry wt) in the liver of goldfish. Zinc concentration in brain tissue is rather constant and is probably well regulated because of a functional role in this organ. Cadmium was only found in the liver and kidney, being approximately four times higher in the latter. Seasonal variations in trace element contents have been demonstrated in some organs of catfish; in the ovary, zinc concentrations could be linked with the reproductive cycle, while in the muscle with a growth cycle.
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