As early as the Song Dynasty (960~1276 AD), it was already domesticated. Goldfish and crucian carp belong to the same species.
Wild crucian carp
Redgrass gold
Scientifically use the same scientific name (Carassius auratus). Goldfish, also known as "golden crucian carp", are similar to cyprinus carpio but have no whiskers, and are ornamental fish that evolved from crucian carp. There are many varieties of goldfish, the colors are red, orange, purple, blue, ink, silver white, five flowers and so on.
Red and white grass gold
Goldfish are easy to raise, and the beautiful goldfish can beautify the environment, which is very popular with people and is an ornamental fish unique to the mainland. The various colors of goldfish are mainly due to the many pigmented skin cells in the dermis layer date pigment cells. There are only 3 kinds of color components of goldfish: black pigment cells, orange-yellow pigment cells and light blue reflective tissue. All of these ingredients are found in wild crucian carp. The bright and varied body color of the domestic goldfish is nothing more than the recombination distribution of these 3 components, the change of strength, density, or the disappearance of one, two or three of the components.
Some fish of the same species have different colors between different individuals. Some fish have the same color as the same individual, and within a certain range, change with the background. This is a special adaptation of fish to their living environment. This change, depending on the species, the ability and speed of discoloration will vary.
There are particularly many fish that change color, goldfish is one of them, discoloration is mainly controlled by the nervous system and endocrine system, and most of the color induction mainly relies on the head nervous system. The main reason is to adapt to the ambient color, but there are other factors at the same time. For example, after being irradiated by electric light, a certain color and markings will be displayed. When the fish is injured, sick or lacks oxygen in the water, the water quality becomes poor, the body color of the fish will darken and lose its luster.
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