Are All Marine Fish Hypoosmotic to Seawater? Exploring Osmoregulation in Fish Physiology
Marine bony fishes are hypoosmotic to seawater. Their body fluids have lower solute concentrations than seawater, causing dehydration. To manage this, they drink seawater and excrete excess salt. These fishes cannot survive in freshwater because they cannot effectively regulate osmotic pressure. However, some marine fish, such as certain species of sharks and rays, exhibit a … Read more