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Before improving the release of environmental fish species, the original pond water should be halved and new water should be added. Fertilizer manure 150 kg per acre pond, once every 9 days, applied a total of 3-5 times. Appropriate topdressing of nitrogen-phosphorus-based fertilizers generally applies 1.5-2.5 kg of urea and 3-5 kg ​​of superphosphate per mu of pond, and is applied once every 7 days. Add new water after each fertilization to keep the water transparency at 20-30 cm. Every half a month, use 10 to 15 kg of quicklime to splash water once per acre.
The fish species are mainly used to cultivate grass-fish ponds, which can be used with about 30% of the species such as cockroaches and cockroaches, and ponds with mainly cockroaches and cod species, together with 30% grass-fish species. The ratio of carp and carp species is 5:1. The stocking density should be determined according to the size of the water surface, water depth, fish species specifications and feed supply conditions. For ponds with a water depth of 1.5 meters, 3000-4000 fish species of about 10 centimeters are stocked per acre. The specifications of stocked fish should be neat.
Feeding the feeds from Liqiu to Bailu is the stage of changing fingerlings of fish, and the amount of feed should be strictly controlled. It is advisable to feed them to Bacheng. Raising grass carp, group head carp species, pay attention to the supply of fresh green feed; feeding carp species, should add more animal feed such as snails. The ponds where the main oysters and squid species are cultivated should have moderate amounts of fertilizer and water. After the autumnal equinox, it is still necessary to intensify feeding. For food-eating fish species, appropriate pachyents should be thrown in order to eat well. In addition to guaranteeing moderate fertilizer and water, bran and carp species pools should also be fed in appropriate quantities such as bran, rice bran, and cakes. Before and after the frost fall, the water temperature should be reduced and feed should be added. The daily feed volume should be 3% in the pond fish species. As long as the water temperature is above 7°C, feed should be maintained and avoid feeding prematurely, but fertilization and green feed should be reduced as appropriate.
The adjustment of water quality should be enhanced in the early autumn, and the water should be replaced once in 7 days to prevent the lack of oxygen in the pool water. Before and after the equinox, change the water once in 10 days. The oyster and carp seed ponds are kept at a depth of 20-25 cm. The transparency of the pool of grasses, oysters, oysters and other species is kept at 25-30 cm.
Prevention of fish diseases adheres to the inspection of ponds in the morning and in the evening, regularly disinfecting and improving the water body, feeding and feeding to achieve timing, positioning, quality, and quantity, and promptly remove feed residue. Feed the baits twice a month for 5 days. Found fish diseases, timely diagnosis, symptomatic treatment.
Grasping the intensified cultivation of the fish species in the autumn is the key to raising the survival rate of the species.