Matters needing attention and specific operating steps for culturing river crabs in winter

1. Soak the seedlings

In the traditional method, species Zhuo chooses salt or potassium permanganate to soak. Now many farmers soak the crab seedlings with EM before stocking. The specific methods are as follows: soak the Yifu source em solution 200-300 times, then use an inflatable oxygenation pump to increase oxygen, and then put the crab seedlings into the water for 20-30 minutes. Let the crab seedlings move freely in the water with oxygen feet and bacteria, and carry out water absorption and spitting. Expel harmful substances from the body. This can significantly reduce the first and second molting deaths of river crabs. According to the experimental statistics, the mortality rate of crab seedlings has been reduced by 30% and 40%.

Second, soak and mix feed

In the process of high-yield and high-efficiency river crab culture, the daily feed mainly includes fresh small fish, frozen marine fish, pellet feed and so on, especially fresh small fish and frozen marine fish contain a lot of bacteria, which can easily cause enteritis and pollute the water quality. In breeding, on the one hand, we adjust the feed feeding structure, on the other hand, we combine the use of EM original dew, the specific method is: 1 kg of EM solution diluted 30-50 times, evenly sprayed on 200kg of feed, pile up for 2 hours before feeding. If you feed fresh fish or frozen fish, every 100kg fresh fish or frozen fish slices, soak in 1kg Yifu source em solution 200times for 3 hours before feeding. This can significantly reduce the incidence of river crab enteritis, and less pollution to the water.

III. Water quality regulation

In the process of river crab culture, in May every year, when the temperature rises, the moss begins to die, the pond water gradually thickens, and the water color becomes muddy, which affects the photosynthesis of aquatic plants. At this time, the whole pool should be sprinkled with 100g chlorine dioxide per mu to disinfect the water, and then the whole pool should be sprinkled with EM bacterial liquid. 1 kilogram per mu of water with a depth of 1 kilogram per mu, with an interval of 15 to 20 days, so that the beneficial species in the pond form advantages, increase the transparency of the water body, form fresh, live, tender and refreshing high-quality culture water, make the photosynthesis of aquatic plants normal, improve their ability to purify water quality, and ensure the smooth progress of river crab culture.

After using Yifuyuan EM bacteria solution, the river crab has strong disease resistance, fast weight gain, large specification, good quality, remarkable economic benefit, about 30% increase in yield and 20% to 30% increase in benefit. At present, the microbial preparation represented by Yifuyuan EM has been widely used in our city, and it has changed from the original propaganda and promotion period to the active application period of farmers, which is a strong guarantee for the development of ecological and efficient fishery in our city, and is of great significance to realize the sustainable development of fishery.