Question

Freshwater bony fishes maintain water balance by

Answer 1

Adaptations in freshwater fishes

Freshwater contains a lower salt concentration than seawater.

Hence, the freshwater fishes have a hypertonic environment inside than the outer water body.

Hence, they tend to gain water.

In order to balance the continuous inflow of water, they produce urine in large volumes.

Final answer

(A) excreting hypotonic urine