What is the optimum water temperature for raising koi fish? How often is it best to change the water?

The optimum water temperature is 20℃ ~ 25℃.

In summer, the weather is bad, and the water temperature is as high as 28℃, so it is necessary to completely change the water 1 time in 5-7 days. When the water temperature drops to about 4℃ in winter, the activity of koi fish is slow, the appetite decreases, and the water quality is not easy to deteriorate. Generally, the water is not completely changed unless there are special circumstances.

The breeder can feed the fish 3-4 times a day, but make sure to finish the fish within 5 minutes each time. At the same time, in hot summer or cold winter, the breeder should pay attention to feeding, and try to ensure that feeding is about 1-2 times a day, and the feeding amount should not be too much, so as to ensure that koi fish can finish eating in 10 minutes, and there is no feed residue in the fish tank.

Key points of aquaculture in koi fish

environmental requirement

Koi fish, like goldfish, has no strict requirements on water temperature and water quality. The suitable temperature range is 2℃ ~ 30℃, but it can't resist the sudden change of water temperature and the discomfort of koi fish when the temperature difference suddenly exceeds 2℃ ~ 3℃. The optimum water temperature is 20℃ ~ 25℃. It needs sufficient oxygen and is suitable for living in a slightly alkaline and low hardness water environment.

Feeding requirement

Koi fish is an omnivorous fish, which can eat mollusks, fragments of higher aquatic plants, benthos, even tiny algae or synthetic granular bait.

Fish species selection

Fish species with healthy fish body, no damage, no desquamation and other diseases, bright fish body, various colors and clear boundaries should be selected.

Feeding density

Common carp is a highly adaptable fish, and koi fish has retained this characteristic. They can be raised anywhere from fish tanks to outdoor ponds, and they will soon grow to 30 cm or more, so it is worse to use traditional indoor fish tanks than round plastic pots. Koi fish is a cold-water fish, so it is best to raise koi fish in a hot place with a water depth of more than half a meter in summer.

For general stocking of fish ponds, please refer to the koi fish density table for stocking fish ponds; The density of the aquarium is generally 60 cm× 30 cm× 15 cm, and six koi fish with a body length of 15 cm ~ 20 cm can be raised. 90 cm× 30 cm× 50 cm can stock 8 tails; 110cm× 30cm× 50cm can be stocked10 tail.

Bait feeding

Koi fish is an omnivorous fish. It is best to feed it with synthetic granules, bait, bean cakes, vegetable cakes, bread crumbs, fish worms, clams, crab meat, radishes and duckweed. It is best to feed the fish regularly to avoid the stress reaction of the fish.

Four seasons management

With the change of seasonal temperature, the management methods in koi fish are different.

In spring, when the weather is warm and cold, koi fish begins to recover from hibernation, and the breeding moves from indoor to outdoor, but special attention should be paid to the sudden cooling, covering the film in time to keep the water temperature stable; Plant bait is the main food, and the dosage is gradually increased from less to facilitate the digestion and absorption of koi fish.

When the weather is hot in summer, it is necessary to cover the plastic sunshade net to prevent direct sunlight, and it is most appropriate to reduce the sunlight illumination from 8000 ~ 12000 lux to 5500 ~ 5800 lux.

In autumn, the weather is less rainy and sunny, and the water temperature drops obviously, which is most suitable for the growth of koi fish and can increase the proportion of animals (protein), such as silkworm chrysalis. Increase investment and promote rapid growth.

In winter, the weather is cold. When the temperature drops to 0℃, koi fish should be moved to an indoor fish pond for wintering, and the indoor water temperature should be kept at 2℃ ~ 10℃. Pay attention to keep warm, feed properly and prevent diseases. The wintering period in koi fish is 1 1 to March of the following year.

Extended data

Koi fish is omnivorous. Koi fish is docile by nature, likes to live in groups, is easy to raise, and has strong adaptability to water temperature. It can survive in the water temperature environment of 5-30℃, and the growth water temperature is 2 1-27℃.

Besides the water temperature and the richness of food will affect the growth rate of koi fish, the growth of female and male fish is also very different. The age of koi fish, like most fish, determines the number of scales, which indicates the age of koi fish.

Koi fish is the largest producer in Japan, with the most mature breeding technology and equipment, and a large number of high-quality and pure koi fish, which are sought after by lovers all over the world. Every year, they go to Niigata, the birthplace of Hiroshima and koi fish, to look for Ming carp.

In recent years, China, Malaysia, Singapore, Israel and other emerging countries have sprung up suddenly, and their breeding level and product competitiveness are almost equal to those of Japan, which has strongly impacted the monopoly market structure of Japan.

The ancestor of koi fish is our common edible carp, and the origin of carp is China.

Koi fish has a history of 1000 years in China, with more than 1000 species. There is little difference in body shape among koi fish varieties, which is mainly classified according to different body colors and shapes of spots. It has many colors, such as red, white, yellow, blue-purple, black gold, silver and so on, and the patches on its body are almost identical.

Carp can not only be used for ornamental purposes, but also be used as medicine to treat diseases, which has the effects of invigorating spleen and regulating stomach, inducing diuresis to reduce swelling, relieving cough and asthma and promoting hair growth. Meat can be used to treat portal cirrhosis, chronic nephritis, cough, asthma, puerperal hypogalactia, irregular menstruation or metrorrhagia. Blood can cure mouth and eye deviation; Bile can cure pinkeye and suppurative otitis media.

Mature koi fish can identify gender in the following three ways.

Look at the picture: Abdominal hypertrophy is female; The slender figure is male.

Look at the anus: the anus is wide and flat for women; The man with small anal invagination is a man.

Look at idolization: when the male is about to ejaculate, a small reproductive tumor will grow on his head and pectoral fin, which is idolization.

In the breeding season, all those who are not worshipped are females; Idolization is a hero. Touch the fin with your hand. If there are rough horny protrusions, it is a male fish. Smooth is a female fish. When a mature male fish gently presses his abdomen, white semen will flow out.

References:

Baidu Encyclopedia: koi fish