There are many benthic creatures, aquatic insects, plankton, and weeds in the pond. They can provide bait for fish. The feces and residual baits of fish provide fertilizer for lotus roots, loosen the soil for fish activity, and make lotus roots. The growth provides good soil conditions. Due to the light shade of the lotus leaf, the illumination intensity in the Dianchi Lake environment is relatively weak, and it is suitable for the growth requirement of the yellow catfish to ingest the weak light.
Pond construction. Select ponds with abundant water, good water quality, fertile soil, flat terrain, convenient water inlet and drainage, and strong water retention and fertility. The depth of the pond is 1 to 1.5 meters, the thickness of the mud at the pond bottom is 30 to 40 centimeters, and the pond area is 667 to 3 to 667 square meters. Going well.
Lotus root cultivation. 15~20 days before planting, 800 to 1,000 tons of organic manure, such as manure and chicken manure, per 667 square meters, spread the fertilizer, plow the bottom of the pool, and then routinely sterilize 80 to 100 kg of quick lime. In March 20-25, the pods were planted with 100 to 150 kg per 667 square meters. After planting the alfalfa, the alfalfa was 10 cm deep and the inlet was screened with a 30-mesh sieve to prevent the entry of wild fish and eggs.
Seed stocking. After you have grown your first loquat leaf, you can begin to stock up. 5 to 7 days prior to stocking, each 667 square meters of fermented pigs, 150 to 200 kg of cow dung, and 15 to 20 kg of superphosphate are used for 5 to 7 days before stocking. In order to fertilize the water, 20 cm of new water is added at the same time so that the water level reaches 30 cm. In order to increase the market size of commercial fish, 300 high-quality and large-sized stingray species are stocked every 667 square meters, and the average tail weight is about 30 grams. Fish species are soaked with 3% saline for 5 to 10 minutes before entering the pool to disinfect and prevent disease. The seeding time is April 15-20. After 20 days, the earthworm grows five leaves, and then adds 10 centimeters of new water. At the same time, 10 grass carp and 20 carp per 667 square meters are used, and the specifications are about 20 grams per tail, as a combination of farmed fish. Gradually raise the water level afterwards.
Feeding management. 1. Feeding and feeding. Since domesticated fish species are stocked, there is no need for domestication. The fish species began to feed on the 3rd day after entering the pool and they were fed 2 times a day, which was 7~8 hours in the morning and 4~5 hours in the afternoon. The daily feeding rate was about 3%. The specific feeding amount was based on weather, water quality, and fish. The food and activities are flexible. The bait is a self-made compound feed. The main ingredients are soybean meal, wheat bran, corn, blood meal, fish meal, feed additives, etc. The crude protein content is 30 Henan, the bait is buoyant, and the particle size is 2 to 5 mm. The feed is fed on the feed table. In addition, in order to save artificial feed and increase fresh live fish bait, after entering the month of July, two insect traps were installed above the pond, one of which was an incandescent lamp. , Hang under the loquat leaf, 10 centimeters above the water surface, with two lights on the same vertical plane. After turning on the white light above the sun, when there are a large number of insect moths, turn on the black light below and turn off the white light above. After half an hour, turn off the lights below and turn on the lights above. Repeatedly, the effect of attracting moths is quite good.
2. Water quality regulation and disease prevention. As the temperature continues to rise, new water is added in a timely manner. By early June, the water level has risen to a maximum of 0.5 to 0.8 meters. From July to September, change the water for 10 centimeters every 15 days. Sprinkle once a month with 15 mg/liter lime water to control water quality and prevent disease. Since stingrays are fish without scales, they should not use other topical medicines other than quicklime. They mainly use internal medicines for disease prevention, and feed baits containing oxytetracycline or chloramphenicol 0.2% every 2 months for 3 days. Fish live in a specific ecological environment, coupled with the ecological advantages of fish and cockroaches, symbiosis and mutual benefit, etc., rarely occur during the culture.
Harvest the product. Before harvesting lotus root, the fish should be listed and listed until the end of October, so as to lower the water level and raise the ground temperature, so as to increase the growth and weight gain. When the lotus leaves stop appearing, it indicates that the lotus root has matured. When most of the lotus leaves are still green, they are tender and brittle and sweet. At this time, the market price is high. When the leaves are dull and old, the pool water will be drained.
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