There are many kinds of goldfish and their shapes are quite different. The head is large, including flat head, lion head, goose head, fluffy ball, etc., and there are many tumors in the head. Eyes bulging, eyeball swelling. There are many scales, including transparent scales and pearl scales. There are many colors of the car body, such as gray, red, black, white, blue, variegated, five flowers and so on. Their bodies are long and short.
The color of goldfish is produced by many colored skin cells and jujube pigment cells in dermis. There are only three color components of goldfish: black pigment cells, orange pigment cells and light blue reflective tissue.
All these ingredients exist in wild crucian carp. The bright and changeable body color of domestic goldfish is only caused by the recombination and distribution of these three components, the change of intensity and density, or the disappearance of one, two or three of them.
Extended data:
Goldfish farming had better choose sunny and well-ventilated places, especially suburbs, gardens, reinforced roofs and balconies where the sun can shine from 6 am to noon 12.
Fish farms must be close to water and power. If the water quality of rivers, lakes and seas is not polluted, in order to reduce the cost of fish farming, natural water sources can also be used according to local conditions, and can be used after being inhaled into the filter tank for treatment.
If the water quality of rivers, lakes and seas needs groundwater (deep well water) or tap water because of pollution, fish farms should choose places with high groundwater level or nearby places where tap water pipes can be connected.