Culture of silver carp in lobster pond

The interculture of lobster and silver carp can maximize the utilization of water space, lobster is benthos, mainly in the bottom, while silver carp and bighead carp mainly live in the middle and upper layers of the water. Silver carp does not need to feed, it mainly feeds on plankton in the pond, which can not only purify the water quality of shrimp ponds, but also reduce the harm caused by plankton to lobsters, conducive to the growth of lobsters and increase additional income at the same time.

The mixed culture of lobster and silver carp is a measure to kill many birds with one stone, which can not only purify the water quality but also help the lobster grow healthily, save feed and increase income, and make full use of the water space. but the two combined culture need to do a good job in the construction of the pond, select high-quality lobster seedlings and silver carp seedlings for timely stocking, put bait according to the eating habits of crayfish, and adjust the water quality in time. To ensure that the water quality is fat, alive, tender and cool. Do a good job of catching and releasing crayfish.

1. The construction of the pond. The area of the pond is 20 mu, the water depth is about 1.5m, the ridge of the pond should be compacted, and there should be a certain slope, using asbestos tiles or plastic board around the pond stem to form a 0.5-meter-high anti-escape wall. Choose ponds with no pollution, close to the water source, convenient for injection and drainage, and less silt.

2. Tidy up the pond. At the beginning of March, 150-200 kg of quicklime per mu was sprinkled and disinfected in the whole pond. After 10 days of disinfection, bitter grass and verticillium verticillata were planted in the pond. The planting method of bitter grass is to sow 0.1 kg of bitter grass seeds per mu. Verticillium verticillata is an asexual propagating plant, which is cut into sections and cuttings of 25-30 kg per mu. Moreover, the area of aquatic plants can not be large, and should be controlled within the range of 20-30% of the breeding area, so that it can not only provide a hidden place for lobsters to perch and shed their shells, but also purify the water quality and increase the content of dissolved oxygen in the water. it can also reduce the fighting between lobsters and provide lobsters with very fresh natural plant bait.

3.Seedling of shrimp. The lobster provenance was mainly captured from natural waters at the end of September of the previous year. It is mainly the shrimp that did not meet the market specifications that year or overwintered in the pond the year before. The general planting time is from the end of March to the beginning of April, the stocking density is about 7000 / mu, and the specification is 200,250 / kg. To choose strong, agile action, consistent specifications, complete appendages, disease-free shrimp species.

4. Stocking fish species. Generally, in order to control the water quality and make full use of the plankton in the water, silver carp species can be released in March, 25 silver carp per mu, 5 silver carp, and the specification of fish species is 150g / fish.

5. The transplanting of snails. In order to provide fresh and high-quality protein bait for lobster, it is necessary to put live snails in early April, with a density of about 300 kg per mu, and can also be reinvested from the end of July to early August according to the actual demand, about 150 kg per mu.

6. Bait and fertilize. Crayfish is a large omnivore, like to eat animal bait, but can also eat plant bait. Can feed mixed fish, chickens, ducks and pigs and other livestock and poultry viscera and wheat corn soybean meal, can also be fed with high-quality full-price formula feed.

The total annual feed demand should be determined according to the weight, quantity and feed type of shrimp species. Lobsters grow faster from March to July, and more bait is needed during this period, which is 40% of the annual feed. During the period of high temperature, the growth rate of lobster is very slow, accounting for only 6-8%, and the amount of bait needed from mid-late August to the end of October accounts for about 50% of the whole year. Adopt the way of "four fixed, four look" to carry on bait. Since June, feed twice a day, once in the morning and evening, mainly in the evening, can account for 60% of the total daily feed, and the daily feed intake is 5% of the shrimp body weight.

The snails and weeds in the pond will absorb the fertilizer from the water as they grow, making the water thinner. In order to enable the creatures in the water to grow and reproduce normally, fermented fertilizers need to be stacked in the four corners of the pond from June to July, and stirred with a rake every other week, so that the water quality has the characteristics of "fat, alive, tender and cool".

7. Adjust the water quality. During the period from April to June, the water injection should be controlled at about 20-30cm, and the water should be changed every 10-15 days. The general water change time is about 11:00 in the morning. If you change water at this time, there is little difference in water temperature between the river water and the pool water, and the amount of dissolved oxygen can be increased. During the peak growth period of lobster, fertilizer can be applied every 15 days, and 10 kg quicklime per mu of water depth can be applied to increase the content of calcium in the water. Photosynthetic bacteria solution was used once a month to adjust water quality balance.

8. Fishing in time. To strengthen the management of the pond, in addition to normal pond patrol, disease prevention and floating head prevention, it is also necessary to do a good job of lobster rotation. In general, lobsters can be put on the market after one month, and shrimp cages, ground cages and other capture tools can be used. Since the end of May and the beginning of June, adult shrimp that have reached the market specifications have been caught and sold on the market in time, usually catching large ones, leaving small ones, and restocking a certain number of 4-5cm young shrimp, so that the water body can be fully utilized and the yield of lobster can be increased.

Experience summary and analysis

The mixed culture of lobster and silver carp makes full use of the water space. Raising filter-feeding fish in shrimp ponds can not only increase income, but also maintain ecological balance, maintain a good living environment, reduce costs, and increase income by about 267.5 yuan per mu.

Bait must be uniform, to avoid lobster feeding when fighting each other, livestock and poultry offal should be chopped before feeding. And to adhere to the combination of fine green feed feeding, if a large number of lobsters climb to the shore or aquatic plants, it means to change the water, especially in the middle and later stages of culture, to change the water 1-2 times a week, so that the water contains sufficient dissolved oxygen. High-density breeding needs to pay attention to disease prevention, mainly refers to prevention and control, strict use of dipterex, trichlorfon and other pesticides.