Winter fishery production focuses

As winter approaches, the focus of fishery production is gradually shifting. Recently, the author visited Yang Zhuangzhi, the head of the Chengdu Aquatic Technology Promotion Station, and asked him to introduce the related technical measures, such as fish pond management and fish wintering, which are of general concern to fish farmers.

What kind of work should be done in order to provide favorable conditions for the high yield of adult fish in the coming year? Yang Zhuangzhi said that in summary, winter fish farming should mainly focus on seven areas of work.

Pond renovation

In the winter season, ponds were used to transform ponds, and Xiaotang changed Datang and shallow ponds to deeper ponds. After transformation, it can increase the water capacity of the pond and also improve the pond environment. The well-conditioned ponds are also subject to renovations, dry water, digging thick silt after the sun exposure (retaining about 10 cm), eradicating weeds, and heightening the reinforcement of the pond.

Pond disinfection

Renovated ponds should be sterilized with clear ponds. Commonly used disinfection products include quicklime, bleaching powder and so on. However, the quick disinfecting effect of lime is best, and it can also play a role in fertilizer application; disinfection of clear ponds should be conducted on a sunny day. Dry pool disinfection using 100-150 kg of lime per acre, or bleaching powder 10 kg, dissolved water, the whole pond evenly spilled.

Reasonable stocking

According to the previous year's stocking experience and pond water, food supply conditions and feeding methods, determine the appropriate number of stocking and fish mix. The traditional stocking modes in Chengdu are: stocking of large-scale fish species, stocking 100-150 tails per acre, 20-30 tails of calyx, 200-300 tails of grass carp, 500 tails of carp; or another stocking stock 150 - 200 tails, 25 pods, 100-150 grass carp, and 1000 squid.

Early release of fish species

Early release of fish species will enable fish to adapt to a new living environment earlier, eat earlier, grow early, and relatively prolong the growth period. Generally from the winter solstice to the beginning of spring is the best period for stocking fish, because during this time the temperature and water temperature is relatively low, the scales of the fish close, fishing and stocking operation is not easy to damage the fish, can reduce the incidence of fish species and mortality. The fish species should be selected to be carried out on a sunny or cloudy day when the temperature is not too low. It is easy to freeze the fish body due to the low temperature of the rainy days or the freezing of snow and windy weather. It is not suitable for stocking.

Fish quality

The qualified fish species to be put in place are important conditions for high yield and stable production of adult fish. The size of stocked fingerlings should not be too small, and generally requires one-year-old fingerlings. The head of fish has a small back, a body of stout manure, a full-scale fins, a lively swim, a distinct body color, and no disease or injury.

Disinfection immunity

When the fingerlings are under the pond, they should be soaked and disinfected for 5-10 minutes. Drugs are potassium permanganate 30-40 g / cubic water, or 3-4% of salt, or trichlorfon 8 g / cubic water. Grass carp and other fish species can be injected vaccine immunization better.

Feeding management

As the saying goes, "three points of stocking and seven points of management." After the fishes get down the pond, in case of cold weather, they must deepen the antifreeze in the pool water. When the sunny temperature is high, appropriate feed must be fed to ensure the fish's food needs and promote growth. Usually, the tide pool should be adhered to, which is beneficial to early Find problems and solve them in time. In short, as long as the management of a pond water, will be able to raise a pond fish.

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