First, pay close attention to repair the water damage project of the pond
1. While ensuring the water for fishery production, carefully inspect the dams and facilities of the culture ponds. If the damage to the breeding facilities is serious, block the nets in time to repair the water-damaged pool levees, drainage channels, and large water surface grid-blocking facilities as soon as possible. Dikes with potential for bankruptcy may need to seize the opportunity to heighten and reinforce, minimizing fish escape losses.
2. Use artificial digging and mud pumping as soon as possible to remove silt from ponds and major inlets and outlets. Drain ditches around the cultivated rice fields to conduct scientific drainage and do a good job of checking and repairing the leakage of the ponds. Maintenance to ensure the water retention performance of the culture pond.
Second, strengthen the water quality regulation of the breeding environment
After storms and floods are attacked, the water level of the culture ponds should be adjusted to strengthen the regulation of water quality. The methods are:
1. Use chemical and physical methods to regulate and improve water quality. Aquaculture ponds can be selected for quick-disinfection by quicklime (10 to 15 kg/mu), chlorine dioxide (0.2 mg/L), dibromohydantoin (0.2 mg/L), and iodine preparation (0.3 to 0.5 mg/L).
2, using biological or filtration methods to purify water quality. A filtration pool is set at the inlet of the pond. Sand or charcoal is better for the filter material in the pond. The biological method is to use 10% of the pond water to plant water hyacinth floating plants, which not only plays the role of sedimentation and purification of water quality, but also increases the benefits; Where conditions permit, water amendments or photosynthetic bacteria may be added, and water oxygenation measures may be enhanced.
Third, timely and reasonable replanting seed
After the heavy rain disaster, the production units and farmers need to scientifically ascertain the amount of fish ponds. According to the market demand and their own breeding conditions, they should take measures to supplement the summer fish species or ponds, and maintain a reasonable breeding density in the fish ponds.
1, according to the amount of fish ponds for reasonable recharge. For ponds with a small amount of ponds, after cleaning, choose the species that grow quickly and quickly, such as stingrays, squid, tilapia, etc., for stocking, and store summer squid, squid, and grass carp; Ponds with more ponds are stocked with fish of appropriate specifications, and daily feeding is enhanced.
2, according to the degree of damage to the pond to add or change rearing. For the broken ponds, the water should be drained as soon as possible, thoroughly disinfected with disinfectant such as quicklime, and appropriate amount of stocks for autumn breeding should be diluted and quickly prepared, and be ready for fishery production in the following year. If it is still difficult to solve by adjusting the seedlings, the farming mode can be adjusted, and economic crops can also be cultivated for remediation. Aquaculture seed breeding farms, mainly to protect the broodstock and fish species, should take the method of pond or transfer, try their best to save the broodstock and fish species for use in the coming year.
Fourth, do a good job of prevention and treatment of fish diseases
Storms and floods will enter the high-temperature season. Turbid floods are prone to fish diseases. Disease prevention and treatment and the harmless treatment of dead fish should be effectively carried out, especially for the prevention and control of fulminant fish disease and grass carp.
1. Disinfect the pond water as early as possible.
2. Innocent treatment of dead fish in time. It is most effective to disinfect limestone, bleach, etc., and then deeply buried more than 1 meter.
3. Strengthen aquaculture forecast report. Strengthen the monitoring of epidemic diseases, timely detect the epidemic situation or fishery water pollution accidents, and immediately take corresponding emergency measures to prevent outbreaks of epidemics. Actively reserve fishery materials and purchase fish medicines and fishery materials in a timely manner so that they are prepared.
V. Strengthen aquaculture production management
1, ground tour pond. Due to continuous rainfall, poor lighting conditions in the pond, poor photosynthesis capacity, and low dissolved oxygen in the water, can easily lead to deterioration of water quality and lack of oxygen and flooding ponds. Therefore, it is necessary to strengthen the inspection of the ponds, adhere to the observation ponds of the morning, the middle, and the evening, observe the changes in water color, water quality, the fish’s activities, feeding conditions, and whether there are floating heads or morbidities.
2, timely pond water quality. After the storm, the pond water body is generally more turbid and the water quality is slim. The farmers can take corresponding measures according to the species cultivated, and timely improve the water quality conditions. If the water in the pond is relatively muddy and the sediment content is large, the photosynthesis of the phytoplankton in the water will be affected, and the water in the pool may be drained under conditions, and the fresh water may be replaced; the pond that cannot be injected into fresh water may be used as quicklime (15-20 kg/mu). ) Quanhua splashed water to clarify the water body. After disinfecting the ponds for 5 to 8 days, microbiotics such as photosynthetic bacteria, Bacillus subtilis, and nitrifying bacteria can be used to improve the pond water quality.
3, the rational use of aerator. Continuous rain may easily cause oxygen deficiency at the bottom of the pond. It is necessary to turn on the aerator in time according to the law of “open at noon on sunny days, open in the early morning on cloudy days, and open in midnight on continuous rainy daysâ€. Under normal circumstances, it is required that the oxygen aerator be opened at 1 to 3 o'clock in the afternoon and 2 to 6 o'clock in the morning. Every 2 to 3 hours, under the condition of shower, no wind, and no light, it is necessary to appropriately extend the start time of the oxygenerator. For ponds without oxygen-enhanced machinery, appropriate amount of chemical oxygen-enriching agents should be purchased for emergency use to prevent fish oxygen-free pans.
4, science feeding management. After the storm disaster, the fish is of poor physical quality and must be fed with high-quality fresh feed. Vitamin C, Chinese herbal medicine, and polysaccharides can be added to the compound feed to increase the intrinsic resistance of fish to pathogenic factors. In the feeding, we must do "four sets" and reduce the amount of daily feeding. After the water is fresh, we will resume normal feeding.
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