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Goldfish, ornamental fish

Goldfish, ornamental fish (Picture 1)

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Goldfish are ornamental fishes domesticated from wild crucian carp. China was the first country to domesticate goldfish. Crucian carp in nature has a gray back and white belly, which makes it easier to avoid predators in natural water. Sometimes, the pigment cells of the crucian carp mutate to make the fish golden yellow. If there is no human intervention, such a mutant individual will be eaten by the enemy because it is easy to expose the target. The Chinese began to discover and use this variation at a relatively early time. There are various types of goldfish. According to the traditional classification, they are roughly divided into grass goldfish, dorsal fin and no dorsal fin. Among them, grass goldfish is the most common color crucian carp in the fish market; dorsal fins are divided into literary species and dragon species, and the representative species are lion head and dragon eye; without dorsal fins are divided into egg species and dragon back, and the representative species are orchids. Shouhe Wangtianyan.

In the Tang Dynasty, goldfish were raised by semi-jiahua for good deeds. Since the Song Dynasty, goldfish has been raised and flourished in the Ming and Qing dynasties. After the founding of New China, Chinese scientists have made a lot of contributions to the conservation and breeding of goldfish. Goldfish was introduced to Japan in 1502, and after World War II, Japan introduced many species through Taiwan. Goldfish was introduced to Britain at the end of the 17th century, to Europe in the 18th century, to the United States in 1874, and then spread throughout the world. Chinese scholar Chen Zhen summarized its evolution into 4 stages: ① the wild state of red and yellow crucian carp to the stage of semi-domesticated state; ② the pond culture stage-the beginning of goldfish domestication; ③ the pot culture stage; ④ the conscious artificial selection stage. It is not difficult to see that goldfish evolved from wild crucian carp undergoing long-term natural mutation, artificial selection, hybridization and other factors. There have been many species of goldfish.

Goldfish have a mild temperament and generally have a life span of about 6 years, although some are longer. Goldfish is a kind of omnivorous and carnivorous freshwater fish with well-developed throat teeth and can swallow harder bait. Goldfish have a strong ability to adapt to water temperature, but cannot adapt to drastic changes in temperature. The suitable water temperature is 18-26°C. Too high or too low temperature will affect the feeding, growth and reproduction of goldfish. Goldfish like slightly alkaline water, and the pH value of the water body is more appropriate at 7.5-8.0. At the time when the water temperature began to rise in northern my country, when the water temperature began to rise, goldfish also entered the breeding period. During this period, controlling the water temperature at about 20°C is more conducive to the spawning and hatching of goldfish.

The feeding of bait adheres to the three-determination principle, qualitative: high protein content, fresh and clean; quantitative: pay attention to the time when the goldfish in the pool is eaten each time, generally it is appropriate to eat within 20-30 minutes; timing: around 7:00 in the summer Around three o'clock in the afternoon, because the fish swim less in winter, you can feed them once around noon. It should be noted that every time you feed, you must feed it once, and you need to feed duckweed or a small amount of pellet feed appropriately according to the appetite of the fish. Before the adult fish are stocked, the floating debris and other harmful substances in the pond should be removed. The stocking density of goldfish is 100-400 fish per square meter of 1-3cm and 50-100 fish for 6-10cm. In the fry stage, monoculture is the main method. During the growth process, the stocking density of goldfish should be continuously adjusted according to the growth of the fish.

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