First, seed survival rate is low
When the seed is put in, the long-time transportation will leave the water for a long time. Shrimp species shriveled, and the water was not fully treated when they were stocked. After the shrimps were introduced into the pond, the shrimp species “swelled†due to excessive water absorption. Some of the seeds are trapped by drugs and have a high mortality rate after stocking. Some of the seedlings were released during the cold winter season and were directly frostbite and frozen to death during the stocking process.
The seedlings should be stocked on-site to be stocked. The stocking of shrimp seedlings should be done evenly along the pool, and the distribution should be even. For long-distance transportation of shrimp, when stocking, the shrimp should be soaked in water for 3 to 5 minutes, then put in the pool for 2 to 3 minutes, repeated 2 or 3 times, and after the shrimps have enough water to absorb the shrimp, put them into the shrimp slowly. In the pool, the survival rate of the stocking can be increased, and drug-trapped seeding is prohibited.
Second, high stocking density
The stocking densities in Tangkou are high, and the stocks are stocked in multiple batches in the same Tongkou, and the specifications vary. As a result, the growth rate cannot be synchronized and the ingestion capacity is strong or weak. During the breeding process, the crayfish kill each other and the breeding yield is low. Pond culture of lobster, acres of shrimp 20 to 40 kg, specifications 60 to 80 per kilogram, shrimp specifications require uniform, robust physique, disease-free without injury, and put enough time to avoid batch stocking. At the time of stocking, the shrimp seedlings should be sterilized and sanitized with 3% to 5% salt water.
Third, more predators
Due to the fact that the clear pond is not completely water, it has not been strictly filtered. In shrimp ponds, there are frogs, water snakes, black dragonfly and other predator organisms. Ingestion of juvenile shrimp and soft shell clams invading the clam shell process directly affect the production of lobster. Therefore, the culture of lobster ponds, before the release of seedlings to clear the pond with drugs to kill the enemy pests, commonly used drugs lime, strong chlorine, croton and so on.
Fourth, insufficient light
Many low-yielding shrimp ponds have too many plants, high coverage, low water surface, low water flow, and insufficient light. It leads to low aquaculture production and small market size. The normal water grass coverage is generally about 1/3 of the pond's water surface, in order to facilitate the shade of lobsters and to breed lobster-eating plankton. If the plants are too dense, a wide 3 to 5 meter channel can be cut with a knife every 10 to 15 meters to ensure that the fish pond has enough light-receiving surfaces. From July to August, plants should be replenished in time after rot, in order to meet the needs of lobster growth and clam shells.
Fifth, feeding less than five, feeding a lack of
Due to high stocking densities, insufficient feeding amount, improper feeding methods, incomplete dietary nutrition, and unsuitable mouth and mouth size, some lobsters do not feed on food. One is that the lobsters kill each other; the other is that due to malnutrition, part of the lobsters do not lick; the third is that some of the lobsters escape due to feeding. The amount of daily feeding is based on feeding, eating, and leaving no residual baits. Generally, medium and small lobsters are bred at 15% to 20% of body weight, and adult shrimp are fed at 5% to 10% of body weight, depending on the weight. The food condition of the shrimp is adjusted.
6. Poor water quality conditions
One is that the water quality of the pool is too rich, the pH is too low, or the water quality is lean, and the transparency of the water body is too large, which is not conducive to the growth of the lobster clam shell. Second, the shallow summer water level, the water temperature is higher than the limit temperature, will inhibit the growth of lobsters, promote lobster precocious puberty. Sealing ice in winter can easily cause lobsters to die due to lack of oxygen. The third is that the water level is high and low, causing some lobsters to make holes near the water level, mainly burrowing. Over time, it was adapted to the life of the cave. It was neither pod-crusted nor feeding-growth. Lobster was not divided into males and females. Its size was small, it was too lazy for activity, and the aquaculture production was low. During the aquaculture process, the water level should be kept stable for a long period of time, the water quality should be fresh, and the strict waterproof material should be subject to industrial pollution, pesticide pollution and chemical pollution. If lobsters are found to be unresponsive during the breeding process, they will swim to the shore, float their heads, and climb up to the shore. This indicates that the lack of oxygen is serious and they must be filled with water in time or with aerators.
Seven, poor management
One is that the area of ​​the pond mouth is too large or too small, the slope ratio is small, there is no shallow water layer, which is not conducive to the growth of lobsters; the second is poor facilities for escape prevention, and it is easy to cause lobster to escape; the third is that fishing is not timely, resulting in burrowing of part of the lobsters. Not caught. The area of ​​the mouth of the cultured crayfish is preferably 10-30 mu and the slope ratio is 1:2 to 1:3. Lobster loves to hit a hole and it is necessary to reinforce anti-escape facilities to prevent lobster from escaping. The lobsters are sexually mature every other year. They leave the maternal juveniles in September and are sexually mature from July to August in the next year. The maternal juveniles will be sexually mature from April to May of the second year in June. After sexual maturation of lobsters, males easily die. Usually about 2 months of feeding, when the crawfish a body weight of 40 grams or more, can be listed on the market to increase aquaculture production.
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