why marine fishes excrete urea, whereas aquatic animals excrete ammonia?

Marine fishes live in sea water which is hypertonic to them. They need to conserve water thus excrete urea. The urea also acts as osmoregulator.

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marine fishes excrete urea as they are ureotelic animals. and as we know urea being less toxic than ammonia needs less water to be diffused hence marine fishes secrete urea inspite of ammonia.

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marine fishes excrete urea as they are ureotelic animals. and as we know urea being less toxic than ammonia needs less water to be diffused hence marine fishes secrete urea inspite of ammonia.

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