How to improve the utilization rate of idle fish ponds in winter

After merging ponds in winter to releasing summer flowers in the following year, most fish ponds have a free period of about half a year. If they are comprehensively utilized, the utilization rate and economic benefits of fish ponds can be greatly improved. Here are four ways to make use of winter fry ponds.

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: ① should be released in advance, 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 about 2 meters, generally 125 kg ~ 150 kg 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. Large sizes are required for silver carp and bighead carp, grass carp, herring, herring, carp and carp. ② strengthens its 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 every 2 to 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 body culture, commercial crabs caught from large water bodies can be temporarily reared in idle fish ponds to earn seasonal differences in order to wait for @ # @ 136 crabs @ 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 200kg ~ 300kg, 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, add the water depth to more than 1.5m in winter, and prevent the death of freezing, hypoxia and asphyxiation. When the water temperature is high, you can properly feed some animal (small fish, shrimp) and plant (pumpkin, potato, etc.) bait to ensure fat and strong on the market.

Temporary culture of green shrimp around November every year, green shrimp concentrated fishing and listing, at this time the price is low, you can use free fish ponds to purchase shrimp with smaller specifications for temporary culture, and go on the market around the Spring Festival or in spring. Temporary ponds are required to be in places with convenient transportation, plenty of shrimp sources and easy listing. Per mu of water surface can temporarily raise green shrimp 100 kg ~ 200 kg, should be divided into specifications for temporary culture. During the temporary maintenance period, pay attention to the regulation of water quality, keep the transparency of the pool water between 30cm ~ 40cm, persist in feeding every day, and appropriately increase the amount and times of feeding when the water temperature is above 7 ℃, and do a good job in the management of escape, anoxia and theft prevention.

Planting forage grass in winter fry ponds can also be used to plant ryegrass at the bottom of the pond, which can not only provide feed for adult fish, but also be used as basic fertilizer for breeding fish species in the original fish ponds. ① opened trenches to filter water and sowed seeds at the right time. Drain the empty fish pond, dig trenches around the pond, and dig a soil moisture ditch every 2 meters in order to drain the pond water. The silt can be sown in the form of semi-dry and semi-wet, with 1.5 kilograms of seed per mu. The sowing time should not exceed the end of November at the latest, the early sowing sprouts quickly and the emergence rate is high. ② strengthens management to prevent waterlogging. The seedlings emerged from 5 to 7 days after sowing. When the temperature rises to more than 15 ℃, it will grow 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. ③ cut green at the right time and put the fish in the water. The first cut was carried out in April of the following year to make up for the lack of green feed for adult fish in spring. It will be cut every 20 days or so from now on. About 20 days before the summer flower fry is released, the water is flooded, the water quality is improved, and some duckweed is released. After the summer flowers go down the pond, there is plenty of palatable bait in the pond.