Key points of fishery production in winter

With the advent of winter, the focus of fishery production began to shift gradually. Recently, the author visited Yang Zhuangzhi, director of Chengdu Aquatic Technology Promotion Station, and asked him to introduce to you the related technical measures such as fish pond management and pond fish overwintering, which are of general concern to farmers.

In winter fishery production, what should be done in order to provide favorable conditions for the high yield of adult fish in the coming year? Yang Zhuangzhi said: to sum up, we should mainly do a good job in seven areas in winter.

Pond reconstruction

Transform ponds from small ponds to big ponds and shallow ponds to deep ponds during the winter leisure season. After the transformation, it can not only increase the water capacity of the pond, but also improve the pond environment. The ponds with good conditions should also be renovated, drain the water, dig out the thick silt (keep about 10 cm) after exposure to the sun, eradicate weeds and strengthen the ridges.

Pond disinfection

The repaired pond should be cleaned and sterilized with medicine. Commonly used disinfection drugs are quicklime, bleach and so on. However, the disinfection effect of quicklime is the best, it can also play the role of fertilization, and pond cleaning disinfection should be carried out in sunny days. Dry pond disinfection per mu with 100-150 kg of quicklime, or 10 kg of bleach, after dissolving water, sprinkle evenly throughout the pond.

Rational stocking

The appropriate stocking quantity and the proportion of fish species should be determined according to the stocking experience of the previous year and the supply conditions of fertilizer and water, bait and feeding methods in the pond. The traditional stocking patterns in Chengdu are as follows: 100,150 silver carp, 20-30 flower silver carp, 200,300 grass carp and 500 crucian carp per mu, or another stocking method for silver carp, 25 flower silver carp, 100,150 grass carp and 1000 crucian carp.

Early release of fish species

Early release of fish species can make fish adapt to the new living environment early, eat early, grow earlier, and relatively prolong the growth period. Generally speaking, it is the best time to release fish from the Winter Solstice to the Beginning of Spring, because during this period, the air temperature and water temperature are relatively low, the scales of fish are tight, and it is not easy to hurt fish in fishing and stocking operation, which can reduce the morbidity and mortality of fish species. The release of fish species should be carried out in sunny or cloudy days when the temperature is not too low. In rainy days where the temperature is too low, or in snow, freezing or windy weather, fish are easy to frostbite and should not be stocked.

Fish seed quality

The qualified fish species put in is an important condition for high and stable yield of adult fish. The size of the fish species should be large, not small, generally requiring one-year-old fish with small head and wide back, fat body, complete scale fins, swimming lively, bright body color, disease-free and injury-free.

Disinfection immunity

Fish species should be disinfected by drug immersion for 5-10 minutes when they go into the pond. The drugs are potassium permanganate 30-40 g / cubic water, or salt 3-4%, or trichlorfon 8 g / cubic water. Grass carp and other fish species can be vaccinated with better results.

Feeding and management

As the saying goes, "three points of stocking, seven points of management". After the fish goes into the pond, if the weather becomes cold, it is necessary to deepen the anti-freezing of the pond water. when the weather is sunny and the temperature is high, it is necessary to properly feed some concentrate feed to ensure the eating needs of the fish and promote their growth. usually, they should insist on patrolling the pond, which is conducive to the early detection and timely solution of the problem. In short, as long as you manage a pond of water, you can raise a pond of fish.