September weather gradually cooler, temperature fluctuations, according to the meteorological trend and forecast analysis released by the City Meteorological Bureau, it is expected that there may still be 2 ∽ 3 regional rainstorm weather process in the first half of The month, after mid-to-late September will enter the autumn rain stage of west China, especially in the northeast of Chongqing and southeast of Chongqing rainfall is more than usual, pay close attention to the weather forecast, take measures to strengthen the prevention and response to the adverse impact of rainy days on aquaculture.
First, the main breeding species condition prediction
According to the aquaculture disease monitoring data of the same period in recent years, the key breeds in our city are susceptible to disease as follows:
(1) Grass carp: prone to enteritis, gill rot, hepatobiliary syndrome. Focus on intensive grass carp ponds throughout the city.
(2) Silver carp and bighead carp: prone to bacterial sepsis, silver carp Chinese loach disease, fish species are prone to wheelworm disease in that year. Focus on the main breeding areas of silver carp and bighead carp farming.
(3) Carp and crucian carp: prone to bacterial sepsis, anchorhead bream, and ringworm disease. Focus on high-density aquaculture ponds throughout the city.
2. Prevention and control measures
(1) Preventive measures
1. Scientific feeding. Fresh feed is fed on demand; herbivorous fish (e.g., grass carp) can be fed with green feed; vitamin C or multivitamin can be fed regularly to enhance the anti-stress ability of fish. The space where the feed is stored is as ventilated and dry as possible, and often check whether the feed is moldy and deteriorated; do not feed the medicinal bait for a long time.
2． Pay attention to water quality control. After the early growing season, the fish excrement is more, the water quality is easy to deteriorate, we must pay close attention to water quality changes; regular use of quicklime, to ensure that the pH of the pond water is about 7.5; according to the water quality, the use of suitable water quality improvers to improve water quality and microbial community structure; regular flushing and water exchange, to ensure transparency, so that the water quality of the aquaculture water body is always in good condition.
3. Strengthen production management. It is necessary to pay close attention to weather changes, especially when the pressure of rainy weather is reduced, after heavy rain, and when the water temperature of cold air drops sharply, it is necessary to strengthen the patrol of the pond; frequently open the aerator to prevent or alleviate floating heads; after the rainstorm, the pond water is too turbid and can be sprinkled with quicklime to make the pond water clear; timely fishing to meet the market specifications of commercial fish sales, maintain a reasonable density; fishing selection when the water temperature is low or the dissolved oxygen is high, the amount of feeding is reduced the day before fishing.
4． Pharmacological prophylaxis. Edible hanging bags (baskets) can be used internally to prevent diseases.
(2) Therapeutic measures
1. Bacterial sepsis, gill rot, enteritis disease: sprinkle with chlorine-containing lime (bleaching powder) in the whole pool, 1.0g ~ 1.5g / m3 water body; florfenicol mixing feeding, dosage of 5mg ~ 15mg / kg fish, once a day, continuous serving for 3 days to 5 days.
2. Anchorhead bream, silver carp Chinese bream disease: dilute the whole pool with 4.5% cypermethrin plus 2000 times water, use 0.02ml ~ 0.03ml / m3 water body, check the anchorhead codia stage after 7 days to 10 days, and decide whether to use the drug again according to the recurrence.
3. Hepatobiliary syndrome: reduce or stop eating for a few days, switch to low protein content feed, take liver and gallbladder Likang powder internally, use 0.1g/kg of fish, use for 10 days, and conditionally increase green feed to reduce refined feed.
4. Wheelworm disease, ringworm disease: Wheelworm disease can be mixed with copper sulfate and ferrous sulfate, a single dosage, per 1m3 water body, 0.5g and 0.2g formulated into a mixture and then sprinkled in the whole pool. Ringworm disease is diluted with 10% mebendazole plus 2000 times water and then sprinkled throughout the pond, with a dosage of 0.1ml to 0.15ml/m3 water. (Source: Chongqing Aquatic Animal Disease Prevention and Control Center)