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
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.
fresh water because salt water fish are so delicate and will most properly die if you don't have experience in fish keeping.
Not really salt water fish can adapt to fresh water but it will take a while.
Both kinds of fish can live in a delta area. The line between salt water fish and fresh water fish seems to be getting blurrier. Sharks and other typically salt water fish are found many miles up stream in rivers that empty into the ocean. It appears that salt water fish adapt better than fresh water fish as the fish found in fresh water are not found out at sea.
If the salt water fish were to be put in fresh water then their high salt content inside their bodies (to prevent too much salt diffusing into their bodies) will have it diffusing out down the concentration gradient; killing them. If the fresh water fish were to be put in salt water then their low salt content inside their bodies (to prevent too much salt diffusing out of their bodies) will have it diffusing in again down the concentration gradient; killing them.
Fresh water
Most salt water fish will die if placed in fresh water.
Well it depends on the fish. If it is a fresh water fish then it lives in fresh water, salt water fish live in salt water.
Fresh water.
fresh water .my fish are 16 yrs old
It depends on the type of fish. If it is a saltwater fish than it lives in salt water, but if it is a fresh water fish than it lives in freshwater.
There are fish that are commonly called "Bream" in both fresh and salt water.
It is a marine fish found in the atlantic ocean.
fresh, its a tetra if its this one