There are more than 20,000 species of fish in the world, among which tropical and subtropical waters have the most species. It can reproduce many times, and it is colorful and attractive.

These characteristics are conducive to the evolution of variety. On the one hand, natural tropical fish mutate in the process of reproduction, hybridization, and generation of offspring in a specific water environment. On the other hand, since the discovery of various beautiful tropical fish, many new species have been obtained through continuous artificial optimization, hybridization and directional cultivation in artificial water bodies for thousands of years.

Some of them become smaller, suitable for viewing steamed buns in small water bodies. Some species originally lived in brackish and semi-fresh waters of shallow seas in estuaries. As a result of artificial domestication, they adapted to live in fresh water and became freshwater tropical fish species, thus forming such a large variety of tropical fish species now.

Because the tropical fish includes many species of genus, coupled with the continuous natural melting and artificial cultivation screening, its body shape, color, personality and swimming style are strange and varied.

For example: Angelfish is handsome in shape, elegant in color, graceful in swimming, graceful in manners, unrestrained, and demure. It once caused a sensation and frenzy among German tropical fish lovers, and was dubbed the queen fish. Lotus Lantern Fish, Pearl Mary, Xiao Lili, etc., the body surface is like a jewel, shining like a diamond. Although the kissing fish does not have a charming appearance, the kiss between the two fish is unique. The patterns and colors of guppies are ever-changing and beautiful. The map fish can swim to the feeder to pick up the food, but the big angelfish expresses great resentment for human harassment, etc., which is not interesting. Some large fish also know how to be friendly with their owners.