According to Baidu Encyclopedia, swallow fish is produced in Guyana, Peru, Suriname and other countries in the Amazon River basin. Swallow fish is docile, likes to swim in the upper water and has group swimming. Wild swallowtail fish can jump out of the water and fly several meters away to avoid being chased by the enemy. Swallow fish is the only fish that can "fly". Unlike flying fish, they swing their pectoral fins quickly when flying, just like hummingbirds. Weakly acidic soft water is preferred, and the water temperature is 23-30℃. Therefore, swallow fish is a freshwater fish, and the sea tanks are all made of seawater, which is alkaline and unacceptable.