Most ponds in mountainous areas are mostly old ponds, mountain ponds, and dead pools; ponds that are convenient for drainage and irrigation, and standardized as a piece of pond are less. In order to have a stable, high-yield and high-value fish culture, it is necessary to grasp the following aspects:
1, clear pond disinfection
First of all, catch all kinds of fish in the original pond, and then put dry water for a few days, and then reinforce and reinforce the pond embankment to plug loopholes. Second, use drugs to disinfect fish ponds. Commonly used drugs and usage and dosage are as follows.
1 Lime, pond surface per mu (only a small amount of water left) with 50 to 70 kilograms of water after the Quanchiposa, if you can not put dried pond water, according to about 1 meter per acre with 150 kilograms of quicklime, Quanchiposa.
2 tea bran, according to 1 meter deep per acre with 50 kilograms of water, said after the tea bran is crushed and soaked for 48 hours; then, plus 3 to 5 kg of lime with slag with the whole pool evenly spilled.
3 strong chlorine plus lime mixing pond, 1 meter per acre depth, with quicklime 70 to 80 kg, 1.5 to 2.0 kg of strong chlorine fines, the respective water after Quanchiposa. After disinfecting the fish ponds, each of the above-mentioned drugs will take about 7 days to put the fish. It is better to put a few fishes to test the water first. Putting the fish into the pond from the morning to the evening will not see the death of the fish, such as fish. Activities are normal, demonstrating that the toxicity has disappeared and that large numbers of fish can be thrown in.
2. Reasonable ratio of polyculture
In general, grass ponds and fish-based fish ponds are calculated on the average water depth of 1 meter per acre of water, and 6 to 8 inches of grass carp seedlings are placed at 200 to 250 tails; 4 to 5 inches of larvae and seedlings are respectively 100 and 25 to 30 tails. 10 feng feng 60 tails; 60 pheasants (or mai 鲮); 50 60 60 湘 tail of Xiangyun 鲫 or feng sheng; 30 40 40 tails of unisexual tilapia; Tail; 4 to 5 inches of maggot 50 to 60 tails; 9 toward the end of 500 to 600 tons of earth mullet. With a variety of fry, depending on the conditions of the pond, if the new pond convenient irrigation and drainage, the density can be more: If the fertilizer pond or dead pool, the density should be smaller, but can be appropriate to increase the eel, carp, less grass carp.
3, vaccine injection
When farmers purchase fish fry, they must choose the fish fry with uniform size, robust physique, and no injury. However, before the release of grass fry, immunization must be performed. This method is the most effective measure to prevent the occurrence of fish disease. Usually 4 to 5 inches of grass carp seedlings are injected with 0.2 ml of vaccine per tail (individuals can increase their doses appropriately).
However, the quality of seedlings has a direct impact on the effectiveness of prevention and control. Many existing small traders have, for their own benefit, arbitrarily purchased inferior or improperly kept or expired vaccines and deceive farmers. It is best for farmers to go directly to the local fisheries department to purchase vaccines and consult relevant technical issues.
4, fingerling disinfection
After frying the vaccine, it is then disinfected with crude saline or potassium permanganate or crystal trichlorfon. General fish fry before soaking with 3% ~ 4% of crude salt water for 5 minutes, or 5 grams per cubic meter of water with 5 g of crystallized trichlorfon dipped in 5 minutes, or 2 g of potassium permanganate per cubic meter of water after melting Dip for 30 minutes. Disinfect by immersion and then slowly pour the fish into the pond.
Through the above measures, the fish fry can greatly reduce the occurrence of fish diseases, improve the survival rate of pond fish, and effectively increase the fish production and output value per unit area.
Ningbo DOKEE Medical Technology Co., Ltd. , https://www.dokeemedical.com