In order to increase the efficiency of raising crabs and increase production and efficiency, it is necessary to grasp crab-rearing techniques, combine pond conditions, and do day-to-day management in accordance with local conditions so as to make crabs scientifically.
One, reasonable feeding to do four to see
Reasonable feeding is the key to breeding, which can increase the utilization rate of the bait, reduce waste and avoid polluting the water body, and at the same time can avoid mutual killing and biting due to lack of bait between the crabs. To achieve reasonable feeding, it is necessary to determine the type and quantity of bait to be put on by looking at the weather, seeing the color of the water, watching the season, watching the crabs and their activities (ie, looking at four things). Look at the weather: when it's sunny, it's more to vote, and rain is less to vote. Look at the water color: when the water color is good, it's better to cast more, and when the water color is poor, it's less to vote. Look at the season: when it's summer, it's more cast. When the water temperature is low in spring and autumn, the water temperature is lower than 10°C. Stop eating; see crab activities and feeding conditions: eat more when you are busy, usually with a slight surplus of food on the second day is appropriate.
During the 7 months of cultivation from March to November, the total bait distribution was mainly concentrated, ie animal food should account for 45%, coarse material (bran, cake, bran, etc.) accounted for 30%, and green material (water Dry grass, etc.) accounts for about 25%. However, in the first half of the year, green materials accounted for 30%, coarse materials 40%, and fine materials 30%; in the second half, green, coarse and fine materials accounted for 15 to 20%, 20%, and 60 to 70%, respectively. Crab weight gains.
The average daily feed amount per year is fed at 8% of the pond crab weight. When the water temperature is within 18°C, it is 5%. From July to October, it is the peak season. The food is fed at 11% of the body weight.
Second, careful management to do a good job
That is, diligently patrols ponds, diligently changes water, diligently eliminates predators, and dilutes and prevents disease.
1. Diligent ponds: To watch on day 3, visit the ponds once in the morning, evening, evening, and learn about crab activities, feeding conditions, and changes in water quality. There must be three key points when it comes to patrol ponds: one is the young crabs' stocking stage, the second is the changing weather in the summer season, and the third is the eve of the autumn harvest, which is when the river crab escapes most severely. It is necessary to strengthen the management of escape prevention.
2. Change the water frequently: In the summer, the pool water is apt to deteriorate. The new water should be filled timely to maintain the fresh water quality. For a pond of more than 3 mu, add 20 to 30 centimeters of water once every 5 days to maintain the corresponding water level. For a small water surface, change the water by 1/4 every 2 to 3 days. Change the water 7 to 10 days in other seasons and keep the dissolved oxygen above 5 mg/l to meet the growth needs.
3. Diligently eliminate predators: Try to catch water, mice and mice, clear the pool of water snakes, frogs, crickets, weasels, etc., drive waterbirds, remove the green mud moss in time to create a good ecological conditions for the river crab.
4. Diligent disinfection and disease prevention: The principle of “one disinfection, two disease prevention and three treatments†should be adhered to, and prevention should be emphasized. Beginning in April, crabs are prone to diseases such as rotten limbs, carapace ulcers, and ciliates. At this time, precautions should be taken. The following methods can be used: 1 Quanchiposa a disinfectant every 15 days or so to prevent germs from multiplying. Commonly used drugs include bromochloroheine, dibromohydantoin, quicklime, bleaching powder, etc.; 2 Use insecticides once a month, such as crabs, fibroin, fibrin nets, etc.; about 34 months, use colitis to kill, promise. Fluoxacin and other internal medicines and baits are fed for one course of treatment and the results are good.
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