Answer:
False
Step-by-step explanation:
The osmoregulatory mechanisms in fishes are the gills, In freshwater, the gills pump in sodium ions, but in the ocean, they need to pump sodium and chloride ions out; to keep the osmoregulation.
The marine fishes gills have a particular type of cells called chloride cells. The membrane of these cells has a sodium and potassium pump that regulates the amount of sodium and potassium that comes and goes inside the cell.