Ornamental fish refer to fish with bright colors or peculiar shapes that are of ornamental value. They are distributed all over the world, with no less than thousands of varieties. Some live in fresh water, some in seawater, some from temperate regions, and some from tropical regions. Some are famous for their gorgeous colors, some for their strange shapes, and some for their rarity.

Ornamental fish in the world ornamental fish market are usually composed of three categories: temperate freshwater ornamental fish, tropical freshwater ornamental fish and tropical seawater ornamental fish.

The temperate freshwater ornamental fish mainly include red crucian carp, Chinese goldfish, Japanese Koi, etc. They mainly come from China and Japan. The body shape of red crucian carp is similar to that of edible crucian carp. It can be divided into red crucian carp, red and white crucian carp and five flower crucian carp according to different body colors. They are mainly kept in lakes or spray pools in tourist attractions.

Tropical freshwater ornamental fish mainly come from the rivers and lakes in the tropical and subtropical regions. They are widely distributed, with a wide variety, different sizes, different body characteristics, colorful colors and very beautiful. According to different original habitats, they mainly come from three regions: first, many countries and regions in the Amazon River Basin in South America, such as Colombia, Paraguay, Guyana, Brazil, Argentina, Mexico and so on; Second, many countries and regions in Southeast Asia, such as Thailand, Malaysia, India, Sri Lanka, and other places; The third is the three great lakes in Africa, namely Lake Malawi, Lake Victoria, and Lake Tanganyika.

Tropical seawater ornamental fish are especially bright in color and rich in body patterns. Many varieties have the nature of self-protection. Some have false eyes on the body surface, some have sharp blades on the tail handle, some have hard and poisonous spines, some can secrete poison, some can change their body color at will, and some are good at imitating. There are a variety of strange shapes, which fully demonstrates the magic charm of nature.