Crucian carp culture temperature

The adaptability of crucian carp is very strong, and their requirements for temperature are not very high. Crucian carp can grow normally under the high temperature of 32 ℃ to the low temperature of 0 ℃. Crucian carp can grow and reproduce in both deep and shallow water, running water and still water. Even in Dali Lake, where the pH value and salinity are high, they can grow normally, so it is easy to raise crucian carp.

Crucian carp have strong adaptability, no matter whether the water is deep or shallow, still water or flowing water, high or low temperature water can survive, even in Dali Lake, which has a PH value as high as 9 and salinity up to 4.5%, it can also grow and reproduce normally.

1. Crucian carp cultured in rice fields

Crucian carp can be cultivated in rice fields with convenient irrigation and good performance of water and fertilizer conservation as long as they have fertile soil. Crucian carp are generally cultivated continuously with double-cropping rice, because the time of single-cropping rice is relatively short, it is difficult to reach the specification of adult fish culture. Before releasing fish fry, it is necessary to dig ridges, fish pits and fish ditches in the rice field according to the area, water source and inlet and outlet of the rice field.

The ridge to be built should be strong and will not leak; the area of the fish pit should be controlled at least 3-5 inches / mu, and the large one should be about 20-30 hectares / mu. In general, the area of the fish pit should be controlled at about 5%, and the water depth in the pit should be controlled at about 80cm. The number of fish ditches can be determined according to the shape and size of the paddy field, and generally can be in the form of "one" shape, "ten" shape, "what" shape, "mouth" shape and "30" shape.

Crucian carp cultured in rice fields can be cultured alone or mixed with other fish. generally, the fry with the size of 5-6.5cm is the best, and the release density is controlled at about 250,500pieces / mu after a week of planting early rice. If there is no bait in the rice field, crucian carp with an average specification of 100g above 20kg can be harvested after autumn, and crucian carp with about 35kg can be harvested if some concentrate feed is fed during culture.

The daily management of crucian carp cultured in paddy field is the same as that of other fish. organic fertilizer should be applied regularly to cultivate the water quality in the paddy field, promote the growth of crucian carp, and make anti-escape facilities around the paddy field to prevent crucian carp from escaping and prevent diseases and enemies.

2. Crucian carp culture in small reservoirs and lakes

Generally choose small lakes or reservoirs with good water quality and rich natural bait for crucian carp to breed, and the best results can be achieved by using fine culture of feeding and fertilization or semi-fine culture of lakes and reservoirs. Choose 1-3 years have dry lake or dry reservoir fishing lakes, reservoirs to cultivate crucian carp, crucian carp production will be very good.

The water surface of lakes and reservoirs is relatively large, and there are relatively many enemy fish in the water. it is best to choose larger fry and control the density at about 20-50 pieces / mu in order to improve the survival rate of crucian carp.

Fish fry can be released in spring and winter, and the number of crucian carp in the high-yield Hubohe reservoir can be appropriately increased every year, and it can be managed according to the technology of pond culture in the process of culture.

In general, the natural bait in the water is sufficient, and the crucian carp cultured in the lake with rich water quality grow faster, and it will also exceed their growth rate in the pond. generally, the size of fish fry put in that year can reach more than 250g, and the number of crucian carp with specifications above 500g also accounts for a large part in the lakes and reservoirs that have been carried out in dry lakes or dry reservoirs in 2-3 years.