1.

Why fresh water fishes excrete large quantity of dilute urine?

Answer»

Freshwater fishes have the problem of excreting excess water because the animals TISSUES are HYPERTONIC to its surroundings. The nephrons have cilia to sweep a LARGE volume of very dilute urine from the body. Freshwater fishes CONSERVE salts by efficient reabsorption of ions from the filtrate in the nephrons.




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