The osmoregulatory and ionoregulatory problems facing a freshwater fish are
A)loss of water and loss of ions.
B)loss of water and gain of ions.
C)gain of water and loss of ions.
D)gain of water and gain of ions.
E)loss of urine and gain of ions.

Question

Quizplus · Accepted Answer

Freshwater fish constantly gain water and lose ions due to the osmotic pressure difference between their internal body fluids and the surrounding water. They actively take in ions through their gills and excrete large amounts of dilute urine to expel the excess water.

The Osmoregulatory and Ionoregulatory Problems Facing a Freshwater Fish Are