In fishes, the gills are the primary organs for excreting nitrogenous wastes like ammonia, urea, and creatinine, although the kidneys also play a role in eliminating less diffusible substances. About 6-10 times more nitrogen is excreted by the gills than by the kidneys.
Nitrogenous wastes such as urea and creatinine are excreted by this organ in fishes?
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