They die because they can not live in saltwater, due to the salt.
it dies
Most salt water fish will die if placed in fresh water.
it will die
They die
If you wish a fresh water fish to be kept alive and well so that it may be studied or kept as a pet. The fish will need to be placed in a suitable container with suitable water that has suitable parameters. Without water a fish will die just like you would die if your air supply was removed. If the fish was a fresh water fish and the water was salt as opposed to fresh, to the fish, it would be similar to what would happen to you if someone put poisoned gas in your personal air supply. You would be extremely ill and then die. So would the fish.
they drown
they will die
the marine fish would pretty much suffocate and die. so putting marine fish in fresh water is not a good idea.
because there is a difference in salinity which means less salt there is alot less in fresh water
beacuse it needs salt.
If the fish are fresh water fish the kidneys would not work. The fish would die.
the fish living in the fresh water eat it and begin to grow larger and more healthy. I put fertilizer in my fresh water fish tanks every other day.