Symptoms and control of mycosis of cultured sea cucumbers

The period from April to August is the high incidence period of mycosis, both young ginseng and adult ginseng will get sick, but the disease did not occur in the seedling stage. At present, no cases of mass death of sea cucumbers caused by mycosis have been found.

The typical appearance symptoms are edema of the ginseng body or decay of the skin. The individuals with edema are bulging, the skin is thin and transparent, the pigmentation is reduced, and the touch of the body has a soft feeling. For individuals with decaying epidermis, the spikes first whiten at the tip of the thorns, and then begin to fester at the center of the thorns, and in severe cases, the spines rot off as white spots, and then the infected area expands, the epidermis fester and fall off, exposing deep subcutaneous tissue and showing blue-white. Although mycosis generally does not cause a large number of deaths of sea cucumbers, the external trauma caused by its infection can cause secondary infection of other pathogens and decline in appearance quality.

The disease is caused by the death and deposition of too much organic matter or macroalgae, resulting in the growth of a large number of molds, and then the disease is caused by mold infecting sea cucumbers. At present, the author has isolated two kinds of pathogenic mold, and the classification work is under way.

The main points of prevention and control include: (1) to prevent too much bait and keep the bottom and water quality clean. (2) avoid excessive reproduction of large green algae and remove the algae sinking to the bottom of the pool in time to prevent the deterioration of the environment at the bottom of the pool. (3) measures should be taken to clean up and bask in the pond to prevent the accumulation of excessive organic matter.