When winter comes to spring, the temperature of the water gradually rises, and the fish begin to ingest and gradually enter the growing period. The management of fish ponds during this period will play a crucial role in capturing the fishery harvest of the whole year and raising the farmers' output and income. Therefore, the farmers are particularly reminded to grasp the following fish pond management techniques: 4. Reasonable feeding: After the spring, the weather gradually warms up. When the water temperature rises to 8°C-10°C, the conventional fish (four major fishes, cockroaches, clams, etc.) start to feed, and the food intake increases with the increase of water temperature. Each feeding should be fixed at regular intervals, once in the previous and afternoon, the feed amount of the concentrate should be 1.5-2.5% of the fish body weight, and the feeding amount should be within 4-6 hours after feeding. In short, the bait should adhere to the principles of “four settings†(fixed-point, timing, qualitative, quantitative). 5, control the depth of fish ponds: spring fish farming, pool water depth should be from shallow to deep, and gradually increase the water level, in order to facilitate the photosynthesis of plankton in the pool water and improve the pool water temperature. Adding water: Add water once a week or so (20-30 cm). The depth of pool water in early spring should be controlled at about 0.8-1.2 meters, and the water level in late spring should be gradually increased to more than 1.5 meters in order to achieve normal breeding water level. 6. Prevention of Fish Diseases: Fish diseases that often occur in the spring are hydromycosis, bacterial gill disease, red skin disease, enteritis disease, and parasite-like anchor head disease. Mainly prevention should be taken and regular medications should be used to disinfect and disinfect. Usually every 15 days bleaching powder 1 mg / kg or quicklime 20 mg / kg watered (also can use standard fishery drugs fish bacteria, chlorine-rich, fish bacteria net) once to prevent bacterial fish disease; 90% monthly Crystal trichlorfene 0.5 mg / kg, evenly spilled once to prevent parasitic diseases.
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1. Disinfection of clear ponds in fish ponds: The ponds must be carefully cleaned and disinfected before they are stocked to kill pathogens to increase the survival rate of the fish. The method is to drain fish pond water, dig out excessive and thick silt at the bottom of the pond and expose the bottom of the pond for several days. At the same time, remove the weeds in the pond, repair and reinforce the pond, block the loopholes, level the bottom of the pool, and then 10-15 days before stocking fish clearing pond with drugs, per acre with lime 75kg-100kg water clear pond.
2. The stocking of fry and fingerlings: intensive rearing of 1500-2000 per acre of fish ponds, 500-1000 tails per acre of stocked fish ponds, and seedlings when the water temperature rises to 8°C requires a healthy body. Neat size, weight 250 grams or more, soaked with salt 3% -5% for 20-30 seconds.
3, a reasonable fertilization: Fertilization is to supplement water nutrients to promote plankton breeding such as bait, to meet the feeding of filter-feeding fish and plankton in the water photosynthesis needs. Generally, 150-200 kg of manure is applied per mu. For chemical fertilisers, nitrogen fertilizer and phosphate fertilizer should be used in combination with some potash fertilizer, and the ratio should be 1:1:0.5.