Management of Pelteobagrus fulvidraco in pollution-free lotus pond

There are many benthos, aquatic insects, plankton, weeds in the lotus root pond, etc., which can provide bait for fish, while fish feces and residual bait can provide fertilizer for lotus root. Fish activities loosen soil and provide good soil conditions for lotus root growth. Due to the shade of lotus leaves, the light intensity in lotus pond environment is weak, which is suitable for feeding and growth of Pelteobagrus fulvidraco in weak light.

Pond construction. Choose a pond with abundant water source, good water quality, fertile soil, flat terrain, convenient water intake and drainage, strong water and fertilizer retention, the depth of the pond is 1~1.5 meters, the thickness of the pond sediment is 30~40 cm, the pond area is 667×3~667×5 square meters, and the east-west direction is good.

Lotus root planting. 15~20 days before planting lotus root; apply 800~1000 kg of fermented chicken manure and other organic fertilizer every 667 square meters, spread the fertilizer evenly, plow and rake the bottom of the pond, and then use 80~100 kg of quicklime for routine disinfection; sow lotus root in spring on March 20~25, use 100~150 kg of lotus root seed every 667 square meters, plant lotus root completely, store water 10 cm deep, filter the water inlet with 30 mesh silk sieve to prevent wild fish and fish eggs from entering.

Seed stocking. After the first lotus leaves grow, you can start breeding. 5~7 days before stocking, 150~200 kg fermented pig and cow dung and 15~20 kg calcium superphosphate were applied every 667 square meters to improve the water quality, and 20 cm new water was added to make the water level reach 30 cm. In order to improve the market specification of commercial fish, 300 high-quality large-size yellow catfish were stocked every 667 square meters, with an average tail weight of about 30 g. Fish pond with 3% of salt water soaked for 5~10 minutes, disinfection and disease prevention. The time of seed release is April 15 ~20. After 20 days, the lotus root grows five leaves, and then 10 cm of new water is added. At the same time, 10 grass carp and 20 silver carp are put into every 667 square meters, with the specification of about 20 grams per tail, as a matched cultured fish. Gradually raise the water level.

Feeding management. 1. Feeding. Because the stocking is domesticated fish species, it is not necessary to feed domestication. Feeding was started on the third day after fingerling population, feeding twice a day, 7~8 am and 4~5 pm respectively, with a daily feeding rate of about 3%. The specific feeding quantity was controlled flexibly according to weather, water quality, fish feeding and activity. The feed is self-made compound feed, the main components are soybean meal, wheat bran, corn, blood meal, fish meal, feed additives, etc., the crude protein content is 30%, the feed is floating, and the particle size is 2 - 5 mm. Feed is fed at fixed points on the feed table. In addition, in order to save artificial feed and increase fresh bait for fish, after July, two insect trap lamps are installed above the pond, one incandescent lamp hanging 20 cm above the lotus leaf; one black light lamp hanging 10 cm above the water surface under the lotus leaf, the two lamps are on the same vertical plane. After dark, first turn on the white light above. When a large number of insects and moths are found, turn on the black light below and turn off the white light above. After half an hour, turn off the lamp below, and then turn on the lamp above, so repeated operation, the moth effect is quite good.

2. Water quality regulation and disease prevention. As the temperature continues to rise, new water is added in time, and by early June, the water level rises to the highest level, reaching about 0.5~0.8 meters. From July to September, 10 cm of water is changed every 15 days, and 15 mg/L quicklime water is sprinkled once a month to regulate water quality and disinfect and prevent diseases. Because Pelteobagrus fulvidraco is scaleless fish, it is not suitable to use other external drugs except quicklime. Internal drugs are mainly used for disease prevention. Baits containing oxytetracycline or chloramphenicol 0.2% are fed every half month for 3 days. Fish live in a specific ecological environment, coupled with the ecological advantages of symbiosis and mutual benefit between fish and lotus roots, so diseases rarely occur during breeding.

Harvest the product. Lotus before harvest should be caught fish listed, to early October all catch, in order to reduce the water level, improve the ground temperature, promote lotus melon increase fat. When the lotus terminal leaves appear, it indicates that the lotus root has matured. Lotus root leaves are still mostly green, lotus tender crisp sweet, at this time the market price is high, when the leaves are yellow to dig old lotus root, drain the pool water, dig with a shovel, you can market.