Monoculture method of black fish with high density in pond

Black fish is a kind of common edible fish in China, with large size, fast growth and high economic value. Before starting to cultivate blackfish, many novice farmers are very concerned about the methods and techniques of culturing blackfish. Let's learn about the relevant information about blackfish with Xiaobian.

Preparation work before breeding

1. Aquaculture facilities: soil ponds, cement ponds, etc. The depth of water is 1m / m / m. The water lifting equipment is complete.

2. Water source: River water, reservoir water, underground well water, etc., and the water quality should be neutral or weakly alkaline.

3. Area: in order to facilitate production management and sales, the area of fish ponds should be smaller, preferably about 1 mu, and the maximum should not exceed 2 mu.

4. It is better to have an inlet and drain. Anti-escape facilities such as a net block of 40ml and 60cm shall be set up around the pool.

5. Plant water grass on the water surface around the pool, generally not more than 20%, as a shelter, easy to block the sun, summer, prey, and at the same time purify water quality and adjust water temperature.

6. The pond must be cleaned and disinfected before putting in the fish seed.

Culture techniques of black fish

1. Stocking of fish species:

① fingerling specifications, choose more than 10 cm (preferably 14Mel 20cm, 60g-100g) in the current year, the specifications of fish fingerling should be the same, no injury or disease.

The best source of ② fingerling is locally produced fish.

The best stocking time for ③ is from September to early October, which can be ingested to restore physique and improve the survival rate of overwintering. It will be released from March to April after 20 years.

④ disinfection: it must be strictly sterilized before entering the pond, generally soaking in 5% salt water for 15 minutes or 10ppm malachite green solution for 10 minutes.

⑤ stocking density: the stocking density is 1.2m deep, about 50ml / mu, about 60g / mu, 8000mu / mu and 5000mu / mu, respectively. If the average water depth decreases, the stocking amount will decrease accordingly.

2. Feeding and management: "four determinations" should be adhered to in baiting. Before feeding, the clapping sound is used as a "signal" to form a "sensory" response, and the black fish are gathered around the food field, which is easy to form a feeding situation, increase food intake and reduce bait waste. The main kinds of bait are fresh animals, mainly sea and fresh water fish and shrimp. In fresh water, there are meal sticks, wheat ears, sand climbing, juvenile fish white, small crucian carp, small horse non-fish, fish skin next to fish, green little, small green shrimp, etc., and sardines, green (yellow) fish and other small miscellaneous fish in the sea water. When eating prosperous food, the amount of bait is about 8% of the weight of the fish, and the high one can reach more than 10%. In the off-season, it is 3MUE 4%. The feeding method of "slow, fast and slow" has a good feeding effect and less feed waste, and most of the fish can stop feeding after running away. The food intake of fish is very different because of the good weather, high and low air pressure and good water quality.

Daily management of black fish

1. Patrol the pond. Observe the feeding, activity and water quality changes of fish, whether there are signs of floating head, sick fish and so on. Problems should be dealt with in a timely manner.

2. Change water. Black fish eat high-protein diet every day, the concentration of ammonia in the pond water is high, especially in summer, the water body is easy to deteriorate. To this end, it is necessary to change the water body in time, generally changing to 1 ℃ per week and 4 to 5 in half a month. Specifically, the change of water quality should be flexibly mastered. Where there are conditions, it is best to keep micro-flow aquaculture. During the culture period, the water temperature should be no higher than 30 ppm.

3. Escape prevention. At the initial stage of black fish stocking, the species was still small and the jumping ability was poor. When growing gradually, the jumping ability is enhanced greatly, especially when the water is changed in rainy days or in the early morning, so the height of the pool ridge from the water surface should generally be more than 50 centimeters, and a strong anti-escape net should be installed at the inlet and outlet. Anti-escape net or anti-escape wall is installed around the pool.

Black fish culture cycle

The fry of black fish are generally released from May to July, depending on the differences in regional air temperature, water temperature, climate and other conditions.

It is difficult to determine how long it takes for black fish to grow to 1500 grams, which is related to your culture technology level, bait quality and other factors, depending on the actual culture environment and so on. It is recommended that you choose good ponds, high-quality seedlings and good-quality bait in the process of culture, and do a good job in daily management and disease prevention in peacetime, so as to shorten the culture cycle of black fish as much as possible. If the culture method is correct, the culture cycle of black fish can be one and a half to two jin a year.

Black fish is very common in our life, not only has high nutritional value, but also has a certain medicinal value, so it is very loved by the broad masses. Therefore, in the process of black fish culture, mastering some skills and daily management of black fish culture is very effective to reduce the culture cost of black fish.