Aquiculture fisher Yu Xuekun of Tangdong Village, Shajiabang Town, Changshu City, ponds and ponds are mixed and cultivated. The total area of ​​farmed area is 14 mu, 130 hectares of river crabs and 30 kilograms of green shrimps, with an average net profit of 9840 yuan, and now his ecology The farming methods are described below.
Before stocking, we will thoroughly disinfect the culture ponds. Each acre shall be treated with 100kg of lime slurry per acre and be disinfected and sterilized in the whole pool. The bottom of the pool shall be exposed for 15 days, and the embankment shall be filled with leaks. After 20 days, the water shall enter 30cm. The inlet and outlet shall be respectively At both ends of the pond, 24 mesh mesh was used to prevent the entry of predator creatures and crabs to escape. Two days after entering the water, we began planting water grass. The water grass was dominated by Elodea, and 5 kg of compound fertilizer was applied per acre after the breeding of Elodea. The planting of water plants adopts seedlings, each of which is 3 meters wide and separated by 3-4 meters in the middle, and the water grass coverage in the pond is about 50%.
The seedlings were stocked on February 15 and put on the crabs with regular specifications, 120 or so kg/kg, strong physique and complete appendages. Before stocking, they were soaked and sterilized with seedlings and disinfectants. 750 crabs were stocked per acre, and young shrimps were placed on February 24 and 15 kg of 1.8-2.2 cm long shrimp per acre.
Breeding Management (1) Lozenge. The snails were released on March 10 to the Qingming Festival. The snails were disinfected before stocking, and 400 kg of snails were stocked per mu. During the peak season of the July-August crab feeding season, 150 kg of snails were added per acre. (2) feeding. Feed was started on March 20, due to the low water temperature in the pond, which was mainly fed with high-quality full-price pellet feed. The feed was fed once a day or once a day, about 0.5 kg per acre. There are feed residues should be timely to reduce the amount of feeding or not vote; entered April with the pond water temperature rise, the crab food intake also gradually increased, the daily feeding amount increased to 1 kg per mu, the feed is mainly based on high-quality compound feed , can be used with a small amount of cooked wheat or corn; from May to June, as the water temperature continues to rise, the food intake of crabs is also increasing, and the daily feeding amount should be gradually increased to 1.5-2 kg depending on the specific situation. Acres, and appropriate increase in the proportion of plant feed; from July to August into the hot season, to feed animal feed, appropriate to add some plant feed (wheat, corn, pumpkin, etc.), the daily feed increased to each Mu 2.5-3 kg.
Water Quality Management (1) Early water quality is fat: During the period from April to May, the water body guarantees a certain degree of fertility, which can ensure the dissolved oxygen in the water body and a certain amount of plankton for shrimps and crabs to eat, and can effectively prevent the spread of moss and water transparency control. In 20-25 cm, the fertilizer method can be used for shrimp and crab fertilizer, and as little inorganic fertilizer as possible. (2) The medium-term water quality should be controlled: the level of water level should be used to control the growth of aquatic plants. With the increase of water level from June to July, aquatic plants also grow continuously. Once every 10 days, photosynthetic bacteria are used to regulate water quality, and the water level is maintained at 80 cm. , Transparency about 30 centimeters, every 1 day Quanchiposa 1 lime slurry to regulate water quality, biological agents and bactericidal drugs should be used at intervals of 5-6 days. (3) Water quality in the later period should be stable: The water level in August-September should be deepened to more than 1 meter. If there are too many plants or rot, they should be promptly removed. Use photosynthetic bacteria once a week in high temperature season, and use substrate modifier every 10 days to maintain the transparency of water body 30-35 cm.
In the early stages of disease prevention and control, ciliates are mainly used to prevent and control ciliates. The combination of water quality regulation and disease prevention during the mid-term increases the resistance of the crabs and provides targeted prevention and treatment. Aquatic product withdrawal period system ensures quality and safety.
Day-to-day management will be conducted twice in the morning and evening to observe river crab activities, feeding, growth of clam shells, water level, water color, and the amount of biological feed in ponds, etc., and record the pond culture, check the pond water quality regularly to prevent water quality deterioration, and do a good job at the pond Disease control of crabs.
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