The management of fish ponds in the spring is the basis for fish affairs throughout the year. In order to obtain good aquaculture benefits, the following nine links should be addressed: 1. Clearing up the clear ponds in the clearing ponds and disinfecting the ponds in winter and spring to seize the whole year's adult fish High production lays a solid foundation. The fish ponds with sufficient water sources can first drain the pool water, remove excess silt and weeds on the dam slope, and let the sun shine on the bottom of the pool and the slope of the dam for water injection for 7 days to 10 days. In case of inconvenient discharge of water, according to the specific conditions, quicklime, bleaching powder and Croton can be used to disinfect the drugs to ensure the healthy growth of the fish. Second, fertility water quality When the spring water temperature rose to above 8 °C should be timely enough to apply base fertilizer, per 1,000 square meters of water can be diluted organic fertilizer 1200 kg to 1500 kg, to promote the rapid growth of pond plankton, for the small fish Provide plenty of green food. After the visual water quality is applied, the top dressing is applied as appropriate. Generally, 1500 kg of decomposed human and animal manure can be applied per 1,000 square meters. Thirdly, it is reasonable to determine that the main and matching species generally have medium and low levels of fish ponds, which are mainly carp and carp, and are supplemented by grasses, cockroaches, and catfish. The grass ponds and grass carp are the main types of fish ponds that produce grasses or natural aquatic grasses. The amount of fish should be matched with oysters, clams, and squid. In the north, squid should be the main source of fish. Fourth, strictly control the size of the fish species and put the density The larger the size of the fish species, the better, may often be subject to conditions, it is recommended that the minimum specifications for the number of major species to be cultivated are as follows: grass, alfalfa, and squid are each 15 cm long. The eel is 6 cm long, eel is 4 cm long, and tilapia is less than 50 per kilogram. Reasonably determine the density of ponds according to the conditions of the pond: ponds with water quality can be used with 2000 to 2500 fish species per 1,000 square meters of water, among which 50% to 70% of the main species are maintained; ~ 1800 tails; ponds with poor water quality put 800 to 1,200 tails per 1,000 square meters of water, producing 250 kg of fish. The quality requirements of fingerlings: neat specifications, robust physique, smooth body surface, no injuries, disease-free, lively and active, strong back-water power. V. Precautions for Disposal Fish seeds should be soaked in salt water or potassium permanganate or other disinfectants for 10 minutes to 15 minutes before the lower pool, and be strictly sterilized and sterilized. The type of fish should be selected to be clear without wind or breeze. The leeward sunny place should be selected at the point of entry. In case of breezy weather, the point of entry should be selected in the upper wind so that the fish can swim into the water themselves. 6. Water quality regulation Regularly or according to water quality, discharge the old water in time, supplement new water, increase dissolved oxygen, and improve water quality. For water-deficient ponds, in case of water quality aging or cross-contamination, one gram of water per cubic meter of water may be used for disinfecting with 1 g of bleaching powder, or 5 g to 10 g of alum or gypsum powder per cubic meter of water may be disinfected to maintain the water color as Yellow-green or yellow-brown, moderately fat and thin, with a transparency of about 30 cm. 7. After the feed is fed to the lower pool of fish, generally, when the temperature of the water rises to above 10°C, start using high quality soybean cake, flour, corn flour or wheat bran to add appropriate amount of green feed to fish, and provide appropriate vitamins and minerals. Substances, the amount of daily feeding gradually increased from 1% of the total body weight to 3%. Normally feed the green material first, and then feed the concentrate after 2 hours, 1 to 2 times a day. The feeding point is gradually induced from the leeward to the sunny place to a fixed set of bait stations to achieve the four targets of timing, positioning, qualitative and quantitative. VIII. Routine management Since the fish species are placed, the pool should be patrolled twice a day. Observe the fish’s activities and feeding conditions, remove the residual baits in time, prevent pollution of the water quality, and keep the water fresh, live, tender and cool to ensure the health of the fish. growing up. The key point of management is to prevent and timely detect fish diseases, to ensure diagnosis and treatment, to eliminate predator organisms and to avoid possible losses. Care must be taken in every link such as feeding, feeding, disinfection, medical treatment, fishing and transportation. , ensure safe production and increase the economic benefits of fish farming. Nine, prevention and control of fish diseases grasp the principle of disease-free early prevention, disease early treatment and prevention and prevention of stress, try to avoid the occurrence of fish disease, every 12 days to 15 days, every 1000 square meters of water with lime 25 kg to 30 kg Dissolved Quanchiposa, disinfection and sterilization.
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