Fish species are released in autumn to ensure survival in autumn.
Strengthening the cultivation of fish species in autumn is the key to improve the survival rate of overwintering fish species.
Improve the environment before the release of fish species, release half of the original pond water, and then add new water. 150 kg fermented manure was applied per mu pond, once every 9 days, for a total of 3-5 times. Appropriate topdressing of chemical fertilizers based on nitrogen and phosphorus, generally 1.5-2.5 kg of urea and 3-5 kg of superphosphate per mu of pond, about once every 7 days. Add fresh water after each fertilization to keep the transparency of the pool water at 20-30 cm. Sprinkle 10-15 kilograms of quicklime on each mu of water every half a month.
Fish species are put into ponds that mainly cultivate grass carp fingerling, which can be matched with about 30% of silver carp and bighead carp species, and ponds that cultivate silver carp and bighead carp fingerling, with 30% grass carp fingerling. The proportion of silver carp and bighead carp is 5 ∶ 1. Stocking density should be determined according to the size of the water surface, water depth, fish species specifications and feed supply and other conditions. Generally, in a pond with a water depth of 1.5m, there are 3000-4000 fish species of about 10cm per mu. The specifications of free-range fish should be neat.
Feed feeding grass carp, blunt snout bream fingerling, pay attention to the supplement of fresh green feed; raising herring fingerling, should add more animal feed such as Corbicula. In the ponds where silver carp and bighead carp are mainly cultured, the fertilizer and water should be moderate. Silver carp and bighead carp fry ponds should not only ensure proper fertilizer and water, but also feed appropriate amount of wheat bran, rice bran, cakes and so on. Before and after Frosts Descent, when the water temperature decreases, concentrate feed should be added, and the daily feeding amount should be 3% of the body weight of fish fry in the pond. As long as the water temperature is above 7 ℃, feeding should be persisted and should not be stopped prematurely, but fertilization and green feed feeding should be reduced as appropriate.
Fish disease prevention and control adhere to the morning and evening pond patrol, regular disinfection to improve the water body, feed to achieve timing, positioning, quality, quantitative, timely removal of feed residue. The bait was given twice a month for 5 days each time. Find fish disease, timely diagnosis, symptomatic treatment.
- Prev
Identification and control of black velvet beetle
Black velvet gold electronic common name blind bump son, big velvet jacket. It mainly damages soybean seedlings with adults (gold electrons), biting growth points or biting young stems. When serious, seedlings can be eaten up, resulting in lack of seedlings and broken strips, or even destruction of land. This insect occurs one generation a year and overwinters as adults in the soil. From late April to early May, they feed on weeds first, and bite bean seedlings after soybean emergence. This insect lurks in the soil at night and comes out to harm during the day. At 3-5 p.m., the number of insects was the highest, and the number of insects was the highest in warm days without wind. Prevention method: available 2.5
- Next
Prevention and treatment of common diseases of fish and crab
First, grass carp bleeding disease: fin, mouth, orbit, muscle, intestinal bleeding, some or all bright red. Prevention and control: 1, the whole pool sprinkled with dibromohydantoin or chlorine dioxide, an average of 1 mu of water depth of 1 meter with dibromohydantoin or chlorine dioxide 200 grams. Use it again every 2-3 days. 2. Feed the bait to Yuerkang, mix 1kg of Yuerkang every 50kg of feed for three days. 3. Feed the bait, mix 50 grams of 50 grams of feed every 50 kilograms of feed, once a day for three days. If combined with dibromine sea for external use
Related
- On the eggshell is a badge full of pride. British Poultry Egg Market and Consumer observation
- British study: 72% of Britons are willing to buy native eggs raised by insects
- Guidelines for friendly egg production revised the increase of space in chicken sheds can not be forced to change feathers and lay eggs.
- Risk of delay in customs clearance Australia suspends lobster exports to China
- Pig semen-the Vector of virus Transmission (4)
- Pig semen-the Vector of virus Transmission (3)
- Five common causes of difficult control of classical swine fever in clinic and their countermeasures
- Foot-and-mouth disease is the most effective way to prevent it!
- PED is the number one killer of piglets and has to be guarded against in autumn and winter.
- What is "yellow fat pig"? Have you ever heard the pig collector talk about "yellow fat pig"?