Tropical fish are generally referred to as the fish species which are found in environments which are tropical, which includes both salt water and freshwater species. One of the most differentiating features of tropical fish is its bright coloration, which is one of the main reasons why these are quite popular as serving as an aquarium fish. In fish which are found in freshwater, this bright coloration is mostly because of iridescence, while fish which are found in salt water are mostly pigmented.
Commonly the term tropical fish refers to those fish which required fresh water for their survival, while tropical fish found in saltwater are mostly referred as marine fish. Of these marine fish, the interesting ones for the fish keepers are those fish which live mostly in close relation with coral reefs. In this kind of environment, the fish species mostly found are amazingly beautiful with their colors breathtaking to watch. These fishes come from quite a complex ecosystem having tremendous biodiversity and thus are the most interesting to watch out for.
Many of these fishes are well camouflaged to protect against their predators. Not only this, but you may most probably encounter several fishes which have developed some type of specialization thus enabling them to adapt to their life on the reefs. It is a fact that the reefs although occupy a very less area in the world, provide over one quarter of total tropical fish supply. These fishes are definitely to watch out for if you ever get an opportunity with a place near reefs.