freshwater fish

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Can Freshwater fish live in salt water, and can Saltwater fish live in freshwater?

If you can’t answer my big question, could you at least tell me the difference (if there is any) in freshwater fish gills and saltwater fish gills? How exactly do gills work? How do they get the oxygen out of the water?

Typically, they cannot cross over. The reason is that they diffuse water and salts across their gills because that’s where the blood is very close to the environment. Freshwater fish want to keep themselves saltier than their surroundings and saltwater fish want to keep themselves less salty than their surroundings. If you were to put them into the wrong environment, they would not have the mechanisms to deal with their new problems.

Gills work by having blood flow close to but in the opposite direction of the flow of water. The deoxygenated blood can pick up oxygen very efficiently this way, through what is called countercurrent exchange.

Check this out:
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