Scientific Koi Breeding Techniques and Methods for Identifying and Preventing Common Fish Diseases
As people's quality of life continues to improve, many people keep some plants and animals at home, and the most common animal kept is the koi, because koi are not only very beautiful in appearance, but also carry very good symbolism. However, koi are still a bit difficult to raise, because koi often get sick. Today I will briefly explain to you some scientific breeding methods and techniques for koi.
Scientific Koi Breeding Techniques
1. Stocking density. Koi have a relatively large appetite, so the stocking density should be appropriate and must not be too high. Usually, for fry over 10cm in size, about 2 to 5 fish per square meter is sufficient, and care should be taken to appropriately reduce the breeding density as the fish grow.
2. Feed feeding. At present, koi breeding mainly involves feeding artificial compound feed, which contains more than 35% protein. When feeding, a taming method is usually adopted so that they develop the habit of rising to the surface to compete for food.
3. After taming is completed, an appropriate amount of bait should be given according to the size of the fish, water quality conditions and climate, ensuring that it can be finished in about 30min each time, and the daily feeding amount generally reaches 5% to 6% of the fish body weight. In spring and autumn, feed once each day at 7 to 8 o'clock and 14 to 15 o'clock; in summer, feed once each day at 6 to 7 o'clock and 15 to 16 o'clock; in winter, usually reduce the feeding frequency or stop feeding bait.
Identification and Prevention of Common Koi Fish Diseases
1. Enteritis disease. Sick fish have reduced appetite, move slowly, often swim alone away from the group, have a darkened body surface, obviously swollen abdomen, and a red and swollen protruding anus. Squeezing the abdominal wall will release yellow-red ascites. At this time, 100mg sulfamethoxazole can be added to the bait per kilogram of body weight, used continuously for 5d. Note that the dosage can be doubled on the first day, or feed with added garlic powder can be given.
2. Saprolegniasis. The fins or body surface of sick fish have cotton-like gray-white hyphae. At this time, 0.4 to 0.6g of vitamin E can be given directly orally to the fish group per 10 kilograms of body weight, which can improve resistance, and sick fish should also be sprayed with a mixed solution composed of 400 to 500mL sodium bicarbonate solution and 400 to 500mL salt solution.
How Long Do Koi Live
1. The average lifespan of koi is about 70 years. Koi, also called benikoi, is the original variety, a red carp. Red carp, as ornamental fish, were already very widespread in the Ming Dynasty. It is said that koi originated from Longzhou koi in Guangxi, China, Xingguo red carp in Jiangxi, and Hangzhou golden carp in Zhejiang. They were introduced to Japan from China in the early period, and after long-term artificial selective breeding by the Japanese people, there are now more than 100 varieties.
2. According to documentary records, Japanese nobles first kept koi in ponds for viewing, and common people rarely saw them. In the early period they were called “benikoi”, “irogoi”, and “hanagoi”, and after World War II they were renamed “koi”. In 1973, as envoys of friendship between the peoples of China and Japan, Japanese koi settled in China. Japanese Boys' Day also features “carp streamers”, which shows the Japanese people's love for koi.
3. Koi originated in China, flourished in Japan, and later returned to China, so it can be said to have gone through a process of “export then domestic sale”. Today, koi are loved by more and more people for their unique masculine beauty, so much so that they have been crowned with the reputation of “king of ornamental fish”.
How Long Does It Take for Koi Fish to Grow Up
1. Koi fish reach adulthood after 2 years and can lay eggs. Koi have a robust physique, brilliant colors, varied patterns, and a majestic swimming posture, with extremely high ornamental and breeding value. Their body length can reach 1-1.5 meters, and their lifespan is also extremely long, able to live 60-70 years (legend says there are koi 200 years old). They symbolize good fortune, are said to bring good luck to their owners, and are highly favored feng shui fish and ornamental pets.
2. Koi have strong adaptability to the environment, with an adaptable temperature of 2 to 30°C. However, they cannot resist sharp changes in water temperature. When the temperature suddenly drops or rises by 2 to 3°C, they are prone to illness. If the temperature change reaches 7 to 8°C, the fish will lie prone at the bottom without eating or moving. If the temperature change is even greater, koi may even die immediately.
Above, I have briefly introduced some scientific breeding techniques related to koi, as well as methods for identifying and preventing common koi fish diseases. I hope these can help you. If you have koi at home, be sure to always pay attention to the condition of the koi. In fact, this can also serve a very good preventive role.