yes
non fish need water to live!
No , some fish live in slat and fresh water but the pet fish you have or want to hve need fresh water.
A seahorse is a fish. It requires ocean water to live.
Mandarin fish are seen occasionally around the coral bommies in the Great Barrier Reef. They need absolutely perfect water conditions and are very hard to keep in an aquarium for any length of time.
Food water oxygen
tropical fish have to live around 75 degrees
Reptiles need land too. Fish do not.
They need water Fish can not process oxygen the same way mammels do. They get their oxygen throu molecules in the water.
Since fish live in water they do not need to drink it as such they simply absorb what is needed.
Starfish live in the sea. They need salty water.
Frogs are amphibians. This means that they can live both out of water and in water. Fish, on the other hand, cannot. They have gills and need water to live. This is the biggest difference.
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.