Comprehensive utilization of idle fish ponds in winter

The cultivation of adult fish in winter fallow ponds can not only increase production, but also adjust the "summer shortage" of the aquatic product market. Due to the short culture period and low temperature, the following techniques should be adopted: first, early stocking, that is, after the fish species are merged into the pond, in order to make full use of the growing period. The stocking amount is calculated with a maximum water depth of 2 meters, generally 125 to 150 kilograms per mu. The stocking proportion is generally about 40% for silver carp, 10% for bighead carp, 30% for grass and carp, and 20% for green carp and carp. The size of the fish should be large, such as 250 grams for bighead carp, 500 grams for grass carp, 100 grams for herring, 1 kilogram for herring and 250 grams for carp. Second, strengthen management. The fish should be fertilized in time after stocking. Fertilization is mainly organic fertilizer to ensure that the pool water has a certain degree of fertility. Choose sunny and warm weather in winter, feed once every 2-3 days, the feeding amount is about 20% of the usual amount, increase the amount of feed in spring with the rise of water temperature, and maintain good water quality, so as to maintain a high growth rate of fish and ensure that the specifications on the market are met as scheduled.

For commercial crabs caught from large water bodies, commercial crabs caught from large water bodies can be temporarily raised in free fish ponds to earn seasonal differences in order to wait or stagger the peak of listing. Before temporary cultivation, the pond was cleaned and disinfected with quicklime or bleach powder, and asbestos tiles, calcium plastic plates and other materials were used to build anti-escape walls. General mu temporary commercial crab 20000kg, it is best to temporarily breed by specification, male and female, keep the water fresh during the temporary culture, the water depth is controlled at about 1 meter, when the water temperature is above 10 ℃, change the water every 2-3 days, the water depth should be more than 1.5m in winter, in order to prevent asphyxia and death after freezing. When the water temperature is high, you can properly feed some animal (small fish, shrimp) and plant (pumpkin, potato and other friends) to ensure that the river crab is fat and strong on the market.

Planting forage grass in winter fry pond can also plant ryegrass at the bottom of the pond, which can not only provide bait for adult fish, but also be used as basic fertilizer for breeding fish in the original fish pond. First, open ditches to filter water and sow seeds at the right time. Drain the empty fish pond. Dig ditches around the pond and dig another soil moisture ditch every 2 meters in order to drain the pool water. The silt can be sown in the form of semi-dry and semi-wet, with 1.5 kilograms of seed per mu. If the sowing is finished before the end of November, the early sowing will sprout quickly and the seedling emergence rate is high. Second, strengthen management to prevent waterlogging. The seedlings emerged 5-7 days after sowing. When the temperature rises to 15 ℃, the forage grass grows rapidly and some chemical fertilizers should be applied. Before the rainy season of the following year, clean the filter ditch ahead of time and prepare for anti-soiling. Third, cut the green at the right time and put the fish in the water. It was cut for the first time in April of the following year to make up for the shortage of adult fish in spring. From then on, he was cut once every 20 days or so. About 20 days before the summer flower fish are released, the water is flooded, the water quality is improved, and some duckweed is released. After the summer flower fish is put into the pond, there is sufficient palatable bait in the pond.