beacuse it needs salt.
Most salt water fish will die if placed in fresh water.
it will die
They die because they can not live in saltwater, due to the salt.
because there is a difference in salinity which means less salt there is alot less in fresh water
Fresh water
There are certain types of perch that live in salt water, so in that case nothing would happen. However, if a fresh water perch was placed in salt water it would die. There are very few fish that can go between salt water and fresh water and perch is not one of them.
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.
Not really salt water fish can adapt to fresh water but it will take a while.
There are fish that are commonly called "Bream" in both fresh and salt water.