At present, about 20% of the loss of crab breeding. In order to help the loss-making households to turn losses into losses, the reasons for the failure of the breeding crabs and the preventive measures are analyzed as follows for reference.
First, the reasons for the failure of breeding
1, clear pond is not complete, cold is not timely. In recent years, about 80% of the crab seedlings are artificially grown crabs. Due to the small size of the bean crab, it is easily endangered by frogs, cockroaches, water mice, and lobsters. According to the expert's dissection of a medium-sized frog, it was found that there were 13 undigested crabs in the internal organs. Another example is a 0.134-hectare crab pond that was used for raising crabs. Since there was no clear pond, 12,000 crabs were put in mid-May. In June, there were many lobsters in the pond. 30 kilograms of lobsters, these lobsters not only compete with crab seedlings, but also endanger the freshly hatched bean crabs, severely affecting crab production.
2. Insufficient supply quantity and low aquaculture production. According to the survey, there are 700 oyster crabs and 2,000 crabs per 0.067 hectare. Practice has proved that 700 button crabs, the survival rate of 60%, only 420 crabs, an average of 125 grams each, a total of only 50.25 kg. The survival rate of 2000 crabs was calculated at 30%. There were only 600 crabs, each weighing an average of 75 grams, for a total of only 45 kilograms. According to the above-mentioned stocking mode, aquaculture will inevitably lose money. At present, Jiangsu, Shanghai and other places generally produce 0.067 hectares of yields of up to 100-150 kilograms, and the highest field can reach 350 kilograms. Their main experience is to win with secrets.
3. Inadequate anti-escape measures and escape from crabs occur from time to time. The escape ability of crabs is very strong. As long as there is a leakage along the inlet and outlet of the pond or other fences that prevent flight, the crabs will flee in groups. There are many examples of crabs causing empty ponds. It can be said that all nine out of nine crabs will have different degrees of crab escape. In a 0.13 hectare crab pond, a total of 12,000 crabs were distributed by a farmer. Since there was a loophole in irrigation and drainage, there was no crab eating on the second day, and only 10 crabs were caught. At present, almost all rivers, irrigation canals and fish ponds around crab ponds have crabs caught everywhere. A net of rivers can catch up to 10 kg of crabs one night.
4. The incidence of mortality is high and the rate of withdrawal is low. The occurrence and mortality of the cultured river crabs are relatively common. In addition to the common diseases such as ciliates, gills, enteritis, and edema, in recent years, a disease called “shaking disease” has been discovered. Poor. For example, one friend used his years of savings to excavate 0.8 hectares of crab ponds. Because of the “shock disease” disasters that occurred for two consecutive years, the drug cost alone cost nearly 10,000 yuan, and the total loss for the two years was 60,000 yuan.
5. Inadequate anti-theft measures are common. Every autumn, when the gonads of the crabs mature, the crabs will climb up and out of the water. Everywhere at night, a flashlight will be found out and searched for crabs. Some people even went into crab ponds to steal crabs. Inadequate anti-theft measures and the theft of adult crabs are another cause of poor crab breeding.
Second, preventive measures
1. Thoroughly clear the pond and destroy the enemy in time. Before clear ponds, catch the crabs in the pond and clean the pond with water. After disinfecting the clear pond with water, it is necessary to check if there are predators, especially frogs, before destroying the seeds. After the seedlings are introduced, they must also adhere to the day-to-day patrol ponds to prevent external enemy enemies from harming the seedlings.
2, to win by secret, increase the yield. According to many years of practice, if the broiler crabs have to be placed around 3,000 hectares per 0.067 hectares, the survival rate is 60%, and 1800 adult crabs, each 100 g, can reach 180 kg. 8,000 animals were released, the survival rate was 30%, and 2400 crabs were produced, each weighing 75 grams, yielding 180 kilograms, and the inner pond output would not exceed 50 kilograms. This would inevitably cause a loss. Actually, the highest breeding level here is 325 kg per 0.067 hectare. For example, there is a family of crab farmers who cultivated crabs with bean crabs in 0.13 hectare ponds. They used 21,000 bean crabs, produced 650 kilograms of crabs, and produced an average of 325 kilograms of crabs per 0.067 hectare. Their experience is small ponds, high density, precision pui pipe, high yield, and high efficiency.
3, to prevent the main, the implementation of healthy culture. First of all, strict pond clearing must be done. After sterilizing with water, 5% salt water was used for bathing for 30 minutes when seedlings were introduced. In the breeding process, regular use of quicklime to prevent disease disinfection.
4. Do a good job of anti-escape measures to prevent all loopholes from occurring. In particular, some new crab-raising households, when installing water inlets and outlets, must be compacted with mud and sealed with cement. Special care should be taken during drainage to prevent accidents.
5, prevent thieves. In autumn, when the crabs come ashore, they should be taken care of by turns and guard against thieves to ensure a bumper harvest.
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