Koi fish, also known as color carp and color carp, is a kind of fish in CYPRINIDAE, and it is an artificially bred variety. Its short and chubby figure and colorful body colors are red, white, black, yellow, blue and purple. It is usually regarded as a mascot, symbolizing good luck, wealth and a bright future. Koi fish has strong adaptability and grows rapidly in warm fresh water environment. Adult fish can reach more than 50 cm in length, and their main food is aquatic plants and plankton.
Koi fish is a variety bred by artificial propagation, which first appeared in the Southern and Northern Dynasties in China. It is one of the traditional ornamental fish species in China. It is also widely cultivated in Japan and European and American countries, among which Japan has many varieties, showing novel patterns and colors, and has become Japan's national treasure fish.
2. Breeding methods in koi fish.
Koi fish is an ornamental fish with fast growth and strong adaptability. The key of aquaculture in koi fish is aquaculture environment, water quality, feeding and management.
The culture environment is an important factor affecting the culture in koi fish. The ideal breeding water temperature is 20-25℃, the PH value is 6.5-8.5, and the breeding density is generally 20-50 fish per cubic meter of water. Feeding bait should be even, appropriate and timely, and feed with high protein, low fat and easy digestion and absorption is better, such as fish feed, worm powder, bean curd residue and so on. Water quality management should promptly remove sewage and residual bait to ensure clean water quality.
3. The implication and culture of koi fish.
Koi fish is endowed with rich moral and cultural connotations, and is often regarded as a symbol of beauty, auspiciousness and blessing. In China, koi fish has long been regarded as the king of grass carp, symbolizing the beautiful meaning of "Carp in Longmen", and there is also the saying of "Carp yue longmen". In the traditional culture of Japan, koi fish is closely related to Shingo, a Japanese military commander, and koi fish's patterns have also been used in various means of transportation, becoming a national treasure and ornamental fish species in Japan.
In addition, koi fish is also widely used in fashion, home and accessories, and has become a part of fashion culture.
4. koi fish's reproductive skills.
The breeding mode in koi fish is mainly artificial breeding, which is generally divided into three types: underwater incubation, floating incubation and exposure incubation. Underwater incubation is to put eggs into water 20-30 cm deep and hatch young fish in three to four days. Floating incubation means that eggs are placed in a special tank and hatched into young fish after about 9 to 10 days. Exposure incubation means that eggs are exposed to water in transparent gauze bags, and after 8 ~ 12 days, young fish are hatched.
The key to aquaculture in koi fish is to choose high-quality fish, stable water quality and suitable aquaculture environment. In the process of culture, the bottom eggshell should be cleaned regularly to keep the water clean and hygienic, and auxiliary bait should be added in time to improve the hatching rate of eggs and the survival rate of young fish.