Feeding nets raise the density of crabs in general, but natural foods alone cannot meet the nutritional needs of river crabs and should be replaced in time. Generally, 200 kg of snails are stocked per acre to maintain ecological balance. Crabs have more complex food habits. Artificial diets that can be fed include: small junk fish, snail meat, animal organs, cereals and corn. In June-September, it is the high season for the growth of crabs. It is necessary to add artificial bait in a timely manner. Especially before the crabs are caught, they must increase the amount of animal feed to increase the market size of crabs. Feeding should be based on water temperature, weather, how much natural food and crab feeding conditions and other flexible feeding amount, usually twice a day vote, 8-9 am and 5-6 pm each vote once a day feeding amount 5-7 % of crab weight. In the morning, feed should be put into the deep water area, and in the afternoon should be put in shallow water areas with aquatic plants.
Water Quality Management Network The water quality management of crabs is mainly to remove dirt and decayed aquatic plants, and to pay attention to the discharge of exogenous sewage and domestic sewage. Usually pay attention to clean the net to prevent mesh clogging. In addition, the shallow-water area of ​​the net enclosure should pay attention to the removal of too much water plants, if the removal is difficult, you can open every 20-30 meters wide a channel about 4 meters wide, in order to ensure smooth water.
Disease prevention and control nets around the crab is generally rare, but it is necessary to do a good job of disease prevention. During the hot season, 20 kg of lime can be splashed into the area where the crabs are concentrated every 15-20 days, and terramycin, dehulling and salt are regularly added to the bait to prevent crab disease.
Preventing the escape of the crabs is the key to keeping the crabs out of the escape net. Check the net perimeter twice a day to see if there is any damage to the net enclosure, whether the stakes are displaced, and if any problems are found, promptly resolve the problem. When the water level rises in the autumn, it is necessary to increase the height of the net suit in a timely manner, especially after the heavy rain and during the later period of cultivation. Special care must be taken to ensure that the river crab escapes.
Water Quality Management Network The water quality management of crabs is mainly to remove dirt and decayed aquatic plants, and to pay attention to the discharge of exogenous sewage and domestic sewage. Usually pay attention to clean the net to prevent mesh clogging. In addition, the shallow-water area of ​​the net enclosure should pay attention to the removal of too much water plants, if the removal is difficult, you can open every 20-30 meters wide a channel about 4 meters wide, in order to ensure smooth water.
Disease prevention and control nets around the crab is generally rare, but it is necessary to do a good job of disease prevention. During the hot season, 20 kg of lime can be splashed into the area where the crabs are concentrated every 15-20 days, and terramycin, dehulling and salt are regularly added to the bait to prevent crab disease.
Preventing the escape of the crabs is the key to keeping the crabs out of the escape net. Check the net perimeter twice a day to see if there is any damage to the net enclosure, whether the stakes are displaced, and if any problems are found, promptly resolve the problem. When the water level rises in the autumn, it is necessary to increase the height of the net suit in a timely manner, especially after the heavy rain and during the later period of cultivation. Special care must be taken to ensure that the river crab escapes.