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I. Fishfield Project Construction
1. Fish farms should choose fields with sufficient water sources, good water quality, no pollution source, and convenient transportation.
2. Open fish ditch and fish gills. Channel catfish is a group of bottom fish, and the cultured channel catfish is deeper than the four large-scale ones. It needs to be more than 1.2 meters, and the area of ​​fish ponds accounts for 8% to 10% of the rice fields. The position of the fishing rod is at the inlet, so that the water quality can be adjusted. The shape of the bowl varies with the field, and it can be round, square, or triangular. The opening of the fish ditch, Tian Da’s “gou†word ditch, and Tian Xiao’s “10†ditch, but they must communicate with each other. It is also advisable to open a ring ditch around the field. The ditch is 30 cm deep and 50 cm wide. Tian Hao can use the earth removed from the excavation to raise and widen it. The height must be more than 50 cm and the width 40 cm. Each field has 1 to 2 spillways. The spillway is 80 cm to 100 cm wide. Install a polyethylene net or wire mesh on the spillway. The upper end is 50 cm above the field and the bottom is buried in the mud.
Second, rice cultivation and fish species
1. Choose rice varieties. The hybrid rice has high shoot height, fertilizer resistance and lodging resistance, and is suitable for cultivation in fish farms.
2. Cultivation methods. It is best to use the planter to plant the plant. The planter can increase the surface of the fish culture, and both the planted rice and the fish in the ditch.
3. Fish fingering. In late June or early July, the species to be placed in summer fish should be mainly catfish tails, supplemented by grass carp, and should not be used for pupa and pupa. Per 667 square meters, 2,000 tails and 500 grass carp feeders should be placed. When fish species are to be put in, care must be taken to ensure that the water temperature of the container for the fish to be shipped is basically the same as the temperature of the rice field, and the temperature difference cannot exceed 3°C to 5°C.
Third, feeding and management
1. Pay attention to environmental regulation. The fish species were first raised in the field and were first raised in the field. During the holding period, the density of the fish was large, and the activity space was small. Therefore, inject fresh water into the fish bladder twice a day to ensure dissolved oxygen and regulate water temperature. If the sun is large and the temperature is high, the number of water injections should be increased.
2. Clean up at a proper time. To clear the fish ditch, the fish can be kept in the larvae for about 2 weeks and can be fed into the field. Since the fish often move in the fields, the silt in the gully will increase and the ditch water will become shallow, affecting the activities and growth of the fish. Therefore, clean up the fish ditch every other week to ensure the smooth flow of fish ditch.
3. Adhere to the field. Every morning and evening, the fields should be inspected to check if there is any leakage, collapse, or blockage of the fish facilities. Fish species should pay attention to the floating head of the fish at any time during the holding period of the fish larvae, and prevent flooding in the event of heavy rain.
4. Scientific fertilization, spraying, feeding. Fertilization in fish farms To ensure the safety of fish, basal fertilizers are mainly used, supplemented by topdressing, farmer manure is applied as much as possible, and less chemical fertilizers are used. If urea and compound fertilizers are used as far as possible, chemical fertilizers are used. Rice pesticides should be selected for low toxicity and high efficiency pesticides. The prevention and treatment of fish diseases should not be used for fish medicines that are prohibited by the State. When the fry was first applied to the field, the individuals were smaller. To select a feed with a higher protein content, the particles should be fine, and it is best to feed the crushing material. As the fish grows, the size of the feed pellets also increases, and the bait is to be “quasi-determined.†The positioning is very important. It is necessary to throw fish into the surimi each time to make the fish produce a feeding habit. For the prevention and treatment of fish diseases and harvesting in the future, the number of feedings can be 1 to 2 times a day, as long as the fish eats 80% full. In order to prevent fish diseases, baits are regularly fed. In addition, every half month of bleaching powder or quicklime disinfects the body of the fish.
Fourth, harvesting and overwintering After the rice is harvested, it will be kept for a month or two. When collecting, first let go of the field water and allow the fish to enter the fishing rod on their own. However, the release of water should be carried out at night and the water discharge rate should be slow. Otherwise, the fish will get into the mud and be difficult to catch. After the fish enters the fish gills, deepen the gurgling water to make the water reach 1.2 meters or more. If necessary, hang it on the gills to prevent freezing. During the winter, the density of fish in the clams reaches a peak. In order to ensure the dissolved oxygen in the clams, fresh water should be replaced every 10 days and a half months, and a small amount of feed can be fed at noon on sunny days to ensure that the fish do not fish.
Breeding of Channel Catfish Back to Rice Field
The American channel fork tail is imported from the United States in 1984. Through more than 20 years of promotion and breeding, it has achieved remarkable economic benefits and has become China's major export of freshwater aquatic products. Therefore, after entering the new century, the country’s large-scale promotion has increased the demand for fingerlings of fingerlings. In particular, the situation of shortage of fry fingerlings has become particularly prominent in some regions. In order to alleviate this situation, the author started using paddy fields in 2007. Breeding the catfish species has received very good economic and social benefits. We will briefly introduce our experience.