AP BIOLOGY

Detailed explanation-1: –In the same way, freshwater animals are also not able to survive in the ocean or salty water because seawater is too salty for them. The water which enters their body continues to flow out of their cells and they will die because of dehydration.

Detailed explanation-2: -Freshwater fish regulate the amount of water going in and out of their bodies through several mechanisms like drinking less water and producing dilute urine. If freshwater fish are put in saltwater, they lose water from their bodies due to the hypertonic environment. Their cells shrivel and die.

Detailed explanation-3: -If you plopped a marine fish in fresh water, it would start absorbing lots of water across its gills. It wouldn’t take long for it to get into trouble with the balance of water and salt in its body. It might even swell up! This is because their bodies are more salty than fresh water, so they absorb water via osmosis.

Detailed explanation-4: -Most fish that live in the ocean tend to lose water–the high salt content of the ocean causes water to constantly flow out through the fish’s gills. So fish need to drink lots of seawater to stay hydrated.

Detailed explanation-5: -If fresh water fish is kept in sea water, it will be exposed to highly concentrated water.So water tends to move out of the fish. Fish will get dehydrated and may die. This is due to osmosis. Water always moves from dilute solution to concentrated solution.