CATDOLL : CATDOLL: How to raise lobsters? How to run a lobster farm

1. Choose a Pond

The water source requires fresh water quality, sufficient dissolved oxygen, and no pollution. Loam clay is preferred, the pond ridge width is more than 3 meters, the slope is 1:2.5, the water depth is 0.8-1.5 meters, the pH value is 7.5-8.5, the pond area should not be too large, generally 3-8 acres are appropriate, rectangular, east-west. When injecting new water into the pond, filter it with 20-40 mesh gauze to prevent wild fish and fish eggs from entering the pond with the water flow. According to the pattern of high irrigation and low drainage, build the water inlet and outlet channels to ensure that the water can be filled and discharged. Crayfish have a strong ability to escape, and anti-escape facilities must be built well. Usually, plastic film, mesh, calcium plastic board or cement board are used to set up anti-escape facilities around the pond ridge to prevent harmful organisms from entering and crayfish from escaping.

2. Pond cleaning and disinfection

Pond cleaning and disinfection can effectively kill harmful organisms (catfish, loach, snakehead, snakehead, rat, etc.), wild fish (carp, crucian carp, etc.) and pathogens in the pond. Quicklime and bleaching powder can be used, which is economical, affordable and safe. The specific operation method is: 1. Quicklime disinfection. Dry disinfection: Use 70 kg of quicklime per mu, dissolve it in water and sprinkle it all over the pond. If conditions permit, use a nail rake to rake it. After a week of drying the pond, inject new water; water disinfection: Calculate the water depth of 1 meter per mu of water surface, dissolve 130 kg of quicklime in water, and sprinkle it evenly throughout the pond. 2. Bleaching powder disinfection. After completely dissolving the bleaching powder containing 30% effective chlorine, sprinkle it evenly throughout the pond, with a dosage of 25 kg per mu.

3. Planting aquatic plants

"Whether the lobsters are good or not depends on whether there are grasses in the pond. Whether the lobsters are big or not depends on the grasses in the pond." Water plants play an important role in lobster farming. First, water plants can make up for the lack of lobster bait and supplement a large amount of vitamins; second, they can prevent wind and waves, absorb some harmful substances in the water, purify the water quality, and balance the water environment; third, they can provide shelter and habitats for young shrimps and molting shrimps, reducing the strong bullying the weak. Generally, the planting area of ​​water plants should account for half of the total area of ​​the pond. Optional varieties: low-stem reeds, wild rice stems, elodea, verticillasters, etc. If conditions permit, you can also put some waste such as empty cans, bamboo tubes, and tree roots at the bottom of the water body. These are the favorite habitats of crayfish.

4. Fertilization of shrimp pond

What are the methods for raising crayfish? Some people think that it doesn't matter whether the pond for raising crayfish is fertilized or not. In fact, applying an appropriate amount of organic fertilizer to the shrimp pond before the lobsters are released can cultivate bait organisms and provide natural bait directly for the shrimp after entering the pond. Use 400 kg/mu of fermented organic fertilizer to maintain the corresponding fertility of the pond water. During the breeding process, as the water level gradually deepens, it is necessary to apply decomposed organic fertilizer. The amount and time of selection depend on the fatness of the water. Generally, no more than 80 kg each time is appropriate. The transparency of the pool water is maintained at about 35 cm.

5. Lobster farming

The release of lobster seedlings is divided into spring and autumn release. The requirements are that the specifications are neat, the appendages are complete, the disease-free and injury-free, and the stocking is sufficient. Before stocking, wash with 5% salt water for 5 to 10 minutes to kill parasites and pathogens. For purchased shrimp seeds, because they are transported away from water for long distances, the seedlings should be soaked in the pond water for 1 minute before entering the pond, lifted and set aside for 2 to 3 minutes, and then soaked for 1 minute. Repeat this 2 to 3 times to allow the seedlings to absorb enough water on the body surface and gill cavity before stocking, which can improve the survival rate. According to the many years of experience of farmers, the survival rate of shrimp seedlings shipped out is very low after long-distance transportation. Properly raising some silver carp and bighead carp in the pond can improve water quality and make full use of bait resources. 1. Stocking of grow-out shrimp in spring. In mid-March, 5,000 to 6,000 young shrimps with a body length of 3 to 5 cm were released. 2. Stocking of broodstock shrimp in autumn. Around September, 500 manually selected lobster broodstock were released per mu, with a male-female ratio of 3:1.

6. Feed selection

Lobsters are omnivorous, so animal feed, plant feed and various artificial feeds should be used together at different stages. Animal feed mainly includes small fish pieces, dried fish meal, snail and mussel meat and various animal offal scraps; plant feed mainly includes rapeseed cake, soybean meal, bran, wheat, corn, pumpkin and various vegetables and aquatic grass.

7. Feeding and Management

Crayfish are usually nocturnal and active at night to look for food. Feeding should be done once a day at 10 am and 4 pm, with the afternoon feeding accounting for about 70% of the total daily feeding amount.

The suitable water temperature for the rapid growth of crayfish is 22~32℃. From June to October, the crayfish's food intake gradually increases. The daily feeding amount can be adjusted appropriately according to the actual fishing situation. At the same time, it can be appropriately increased or decreased according to the weather, water quality and shrimp activity and foraging. The agricultural proverb says it well: the green clothes shed and the red coat is put on. A variety of feed is good. In rainy days, feed less, and in sunny days, the shrimps are happy and fed.

8. Daily Management

Crayfish farming also requires daily inspections of the pond, paying attention to changes in water color and lobster activity. If shrimp are found to have come ashore or are crawling on water plants and are unwilling to enter the water, check whether the water body is lacking in oxygen or the water quality has deteriorated, and take corresponding measures, such as oxygenation and water changes. The pH value should be kept at around 7.5, and the transparency should be around 35 cm. Change the water every half month in April, May, and June, and every ten days in July, August, and September, with 1/3 of the water changed each time. Sprinkle quicklime water every twenty days, using 10 kg/mu of quicklime each time. The water level gradually rises from spring to midsummer, with the deepest not exceeding 1.5 meters. Maintain normal growth of aquatic plants and a certain coverage area. Try to ensure that the surrounding environment remains quiet when lobsters molt in a concentrated manner, and increase the feeding of animal palatable feed after molting to reduce cannibalism. Lobster diseases are much less than other aquatic products, but they should not be underestimated. Prevention is the key in daily life. It is the nature of lobsters to like to escape, especially during the flood season, we must strengthen inspections to prevent shrimps from escaping.

Key points of crayfish breeding technology

Three crops a year

The first batch of seedlings is released from late March to early April. The overwintering seedlings from the good-quality ponds are used, and 4,000 crayfish seedlings are released per mu. Before the seedlings are released, the water plants or bamboo leaves in the pond should be arranged, accounting for 50% of the total area of ​​the pond.

In early spring, fresh minced small fish and shrimp are fed alternately with pellet feed, feeding 1.5 kg dry feed (3 kg fresh minced fish pellets) per mu per day, and gradually increase the feed amount, every 5

Increase the feed by 0.5 kg per mu every day. One month after stocking, feed 5 kg per mu every day. Check the nets 45 days after stocking. When the crayfish weight reaches 34 to 36 per kg, you can catch them again.

The second batch of seedlings is released from late May to early June. After the pond is cleaned and weeds are removed, the late spring seedlings are relatively large, usually 120 to 160 per kilogram. About 22.5 kg and 400 grams of water are released per mu.

(Old crayfish seedlings. After stocking, boiled wheat grains (add 1% salt water and boil until the wheat grains bloom) are fed, 5 to 7.5 kg per day, and stop feeding on rainy days. At the same time,

Bamboo leaf vegetables are planted at the beginning of the month, covering about 50% of the total water area. The second batch of crayfish should be cultured to prevent escape and frequently change the water.

At the beginning of the month, before river crabs are put on the market, they are caught and put on the market. In the middle and late stages of the second batch of shrimp farming (50 days after seedlings are released), the cages are set up every day to catch the big ones and keep the small ones, and the small crayfish are screened and put on the market.

The third seedling planting period is from mid-to-late September to early October. Early seedlings for autumn breeding are put in. The amount of seedlings per mu is appropriately increased. About 5,000 fish are put in per mu of water surface. 200 to 300 fish are selected.

Feed the shrimps with processed fresh fish granules and shrimp feed to promote winter fattening of the broodstock. The amount of feed depends on the weather and water temperature. When the weather is good and the water temperature is above 20℃, feed 2.5 to 4 t/h per day.

kg (the amount of fresh feed increases by 1 time). When the water temperature is below 20 ℃, the feeding amount is reduced by 50%. When the water temperature is below 15 ℃, the feeding amount is reduced by another 50%. When the water temperature is below 10 ℃, the feeding amount is reduced by 50%.

When the water temperature is lower than 10℃, the amount of water injected into the pond should be increased to reach the highest water level of the pond to keep water for winter. When the water temperature of the pond gradually warms up in the second year (early March), the fish can be caught in time.

How to raise lobsters so that they grow bigger and bigger?