Why fresh water fishes excrete large quantity of dilute urine?
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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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In Fresh water fishes:
Conc. of Environmental water < Conc. of the water in fish body fluids
So water moves into fish bodies by osmosis. Because of the large water intake, urine is dilute.
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