Question

Why fresh water fishes produce large quantities of dilute urine?

Answer 1

Fishesh produe dilute urine.

They live in water, which causes excess amount of water in their body.

Thus, they produce dilute urine.

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Answer 2

Answer:

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.