Provide bait to dredge the soil and cultivate Pelteobagrus fulvidraco in pollution-free lotus root field.

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

Interculture of Pelteobagrus fulvidraco with lotus root

Pond construction. Choose a pond with abundant water source, good water quality, fertile soil, flat terrain, convenient water and drainage, strong water and fertilizer conservation, with a depth of 1m to 1.5m, a thickness of 30cm to 40cm, a pond area of 667x3~667x5 square meters, and a good east-west direction.

Planting lotus root. 15-20 days before planting lotus root, apply fermented chicken manure and other organic fertilizer 800~l000 kg every 667m2, spread fertilizer evenly, and plough the bottom of the pond flat, then use 80kg 100kg quicklime to routinely disinfect lotus root in spring from March 20th to 25th, 100kg 150kg lotus root seed for every 667m2 lotus root planting is finished, water storage is 10 cm deep, and the inlet is filtered with 30-mesh silk sieve to prevent wild miscellaneous fish and fish eggs from entering.

Seeding and stocking. After the lotus root grows the first lotus root leaf, you can start stocking. In order to improve the market specification of commercial fish, fermented pig, cow manure and calcium superphosphate were applied every 667 square meters 5-7 days before stocking, in order to improve the water quality, and at the same time, add 20 cm of fresh water to make the water level reach 30 cm. in order to improve the market specification of commercial fish, 300 high-quality large-size yellow croaker fingerlings are released every 667 square meters, with an average tail weight of about 30 grams. Before entering the pond, the fish were soaked in 3% salt water for 5 minutes and 10 minutes, then disinfected and prevented from disease. The release time of seedlings is from April 15 to 20. After 20 days, lotus root grows five leaves, and then add 10 centimeters of fresh water. At the same time, 10 grass carp and 20 silver carp are put in every 667 square meters, each with a specification of about 20 grams, as a match for farmed fish. Gradually raise the water level in the future.

Feeding and management. 1. Feed and feed. Since domesticated fish are released, there is no need for bait domestication. The fish were fed twice a day on the third day after entering the pond, which were 7: 8 a.m. and 4: 5 p.m., respectively, and the daily feeding rate was about 3%. The specific feeding quantity was flexibly controlled according to the weather, water quality, fish eating and activities. The feed is self-made compound feed, which is mainly composed of soybean meal, wheat bran, corn, blood meal, fish meal, feed additive and so on. The content of crude protein is 30, the feed is floating, and the particle size is 2mm. The feed is fed on the feed table at a fixed point. In addition, in order to save artificial feed and increase the fresh bait of fish, two trapping lights were installed above the pond in July, one was incandescent, the other was black light hanging 20 centimeters above the lotus root leaves, hanging under the lotus root leaves and 10 centimeters above the water, the two lamps were on the same vertical plane. First turn on the white light above after dark, and when you find a large number of moths, turn on the black light below and turn off the white light above. Half an hour later, turn off the lights below, and then turn on the lights above, so repeated operation, the effect of trapping moths is quite good.

two。 Water quality regulation and disease prevention. With the continuous rise of the temperature, new water was injected in time, and by the beginning of June, the water level rose to the highest, reaching about 0.5-0.8 meters. From July to September, 10 cm of water should be changed every 15 days and sprinkled with 15 mg / limestone water in the whole pool once a month to regulate water quality and disinfect and prevent diseases. As Pelteobagrus fulvidraco is scaleless fish, it is not suitable to use other topical drugs except quicklime. Internal medicine is mainly used for disease prevention, and the bait containing 0.2% oxytetracycline or chloramphenicol is fed every half a month for 3 days. Fish live in a specific ecological environment, coupled with the symbiosis and mutual benefit of ecological advantages between fish and lotus root, the disease rarely occurs during the culture period.

Harvest the product. Before the lotus root harvest, the fish should be caught and listed one after another, and all the fish should be caught in the first ten days of October, so as to lower the water level, increase the soil temperature and promote the increase of lotus root melon. When the lotus root terminating leaves appear, it shows that the lotus root has matured. When most of the standing leaves of lotus root are still turquoise, the lotus root is tender, crisp and sweet, and the market price is high. When the leaves are withered and yellow, drain the pond water and dig it with a spade, then it can be listed on the market.