Wild guppies are usually concentrated in tropical waters and subtropical waters, and guppies belong to ornamental fish, which is very consistent with the definition of tropical fish. Besides, tropical fish like to live in a warm environment. Their temperature requirements are usually above 20 C, and even can withstand high temperatures of 30 C. The temperature range that guppies can tolerate is 20 ~ 30 ℃. If the temperature is slightly higher or lower than this range, they can also survive, so they meet the temperature standard of tropical fish. Therefore, guppies belong to tropical fish.
From the water quality of the guppy's living environment, it can be classified as a freshwater fish. Because freshwater fish can only be raised in water with a salinity of less than 0.05%, they can not survive in seawater or higher salinity water. For guppies, if they are cultured in seawater, the osmotic pressure in the water is high, and the water loss of the cells in the fish body will lead to dehydration and death of the fish, which meets the requirements of freshwater fish for water sources. Therefore, when raising guppies, freshwater fish, the water used must ensure that its salinity is less than 0.05%, otherwise it will not be conducive to the survival of fish. Generally speaking, domestic guppies are usually cultured in tap water after drying.
