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tropical fish
Tropical fish are generally those fish found in aquatic tropical environments around the world, including both freshwater and salt water species. Fishkeepers often keep tropical fish in freshwater and saltwater aquariums.
==Aquarium fish==
Tropical fish is a term commonly used to refer to fish that are kept in heated aquariums. Freshwater tropical fish are more commonly kept than Saltwater tropical fish due to the common availability of fresh water sources, such as tap water, whereas Saltwater is not commonly available and has to be recreated by using freshwater with sea salt additions. Salt water has to be monitored to maintain the correct salinity because of the effects of evaporation. Freshwater tropical aquariums can be maintained by simply topping up with fresh water.
Tropical fish are popular choices for aquariums due to their often bright coloration, which typically derives from both pigmented cells and iridescent cells. Tropical fish may include wild-caught specimens, individuals born in captivity including lines selectively bred for special physical features, such as long fins, or particular colorations, such as albino. Some fish may be hybrids of more than one species.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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