In hot weather, a large number of crabs died. What is the reason?

Eriocheir sinensis culture has entered the later stage, but the arrival of high temperature day is likely to bring high risk to Eriocheir sinensis culture, and the serious death of Eriocheir sinensis pond means loss. What are the causes of crab death during high temperature?

The pH value of1is high for a long time, and the photosynthesis of aquatic plants is vigorous during the high temperature in the crab pond, which leads to the high pH value in the pond, long-term chronic poisoning of crabs and crab death. Aquatic plants thrive. I suggest that friends pull up some aquatic plants in the pond and often transfer water with Dr. Shui and Jin Yishen.

During the high temperature period, cyanobacteria broke out in the pond. Many people chose to kill cyanobacteria blindly, and did not do a good job of oxygenation and detoxification during the period, which led to the lack of oxygen in river crabs. When treating cyanobacteria at high temperature, we must choose windy weather or local treatment. When dealing with cyanobacteria, we must do a good job of increasing oxygen and must not be careless.

Rainstorm stress and high temperature period, especially rain and thunderstorm, easily lead to algae bloom in the pond, and the physical and chemical indexes of the pond change, and the death of river crabs suddenly increases, and then the death decreases. During a thunderstorm, you must use gold polysaccharide and anti-tingling to strengthen your physique. At night, the mixture was modified with atomic oxygen and total effective bottom to prevent bottom hypoxia.

River crabs have black gills and yellow gills. Recently, many river crabs have found the phenomenon of black cheeks and yellow cheeks, accompanied by edema. This is because the early disinfection of river crabs was not done well, which led to bacterial infection of river crabs. A small number of deaths can be treated with gold polysaccharide and natural enemy Vibrio twice.

5 The water body is turbid. This year, the stocking amount of crab farmers increased, the load of ponds increased, and the water plants were single, resulting in turbid and white water quality.

6 feed is single. Due to the increase of river crabs per unit water body, the feed is mainly commercial pellet feed, or the animal feed is mainly small fish, resulting in unbalanced nutrition of river crabs.

7 medication confusion. In order to pursue good profits and not destroy the pond water environment and the living space of river crabs, farmers all use microbial agents. While I was using microbial agents, I didn't realize the time and effect of microbial agents in the pond. I continued to use other fungicides, thinking that I could use drugs, but it didn't actually play the role of microbial agents.