mostly rivers and lakes (=
fresh water fish are fish that live in fresh water fresh water is what you would get out of the tap at home as aposed to salt water witch contains salt
No they cannot, its why they're so called.
Mostly in the ocean...
I think you mean tap water. Tap water or pipe water as it is sometimes called sometimes has in too much chlorine. But tropical fish are still fresh water fishes. What I have heard some people do is before they introduce their pet fishes to a aquarium they fill the aquarium and leave the water for 3 days to a week and then add the fishes. This is because I think I was told it reduces the chlorine content in the water making it safer for the fish. But if you are referring to tropical fishes as fish that live in the sea. Well sea water fishes cannot live in water because sea water is not their natural habitat. The fresh water does not have in the essential components for the sea water fish to survive in fresh water. Fresh water fish cannot live in the ocean or sea either this is because the pH of the water will kill fresh water fishes. But they are brackish water fishes which can live in water that has more salinity than fresh water, but not as much as seawater.
parameciums live in water... (ponds, lakes, streams)
Some do- salmon spawn in fresh water but live mostly in the ocean. Most fish live in either one or the other, not both.
Yes. Red Tailed Sharks are fresh water.
lots live in water like fishes and sea mammals (otters, seals, dolphins, sealions,whales. i.e) but it depends on what water it is, fresh or sea (salty)
sea sponges are found in mostly in salt water, but a few live in fresh water.
Rotifers mostly live in fresh watre environments, however some can live in salt water and damp soil.
Because their blood chemistry is designed to be in homeostasis with a saline medium. In fresh water, water will enter the fishes tissues and kill it. However some fish (eels and salmon) have evolved to live in both environments.
Saltwater fish require salt water, and fresh water fish need fresh water, you can't mix them, or the fish will die. You need to look at each individual fishes needs as to what temp they need their water to be. There are some saltwater fish that can survive in fresh water, but it is not healthy for them.