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well a shark is a fish so the bullshark can come into this group.

if you want a fish like a stereotypical fish then it would probably mean certain death to most fish as only 2% of fish are known to live in both

if you want to no what these 2%are then i do not know but you can do more reaserch if you wish

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12y ago
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14y ago

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.

In addition, some fish can survive in both saltwater and freshwater.

Examples are many salmon species, eels that migrate from freshwater to breeding areas in the ocean and back again as well as some trout species.

I'm sure there are others.

They have the ability to regulate the salt level in their bodies, where most other fish can't.

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14y ago

fresh water because salt water fish are so delicate and will most properly die if you don't have experience in fish keeping.

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Q: Can fresh water fish adapt to salt water?
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