What are the pests and diseases in cage culture of scallops and how to prevent them?

According to the prediction of aquatic diseases and the analysis of research reports published over the years, the diseases of scallop mainly occur in the stage of larvae, with virus as the main pathogen, which is often difficult to control after the onset, and can lead to extinction in severe cases; The diseases of scallop during the growth period mainly occur from June to 10 every year, especially in the high temperature period. The outbreak of the disease has the characteristics of gradual development from south to north, which shows that its etiology is related to the stress of environmental factors such as water temperature and the comprehensive action of parasitic biological pathogens. Due to the large-scale death of scallop culture for several years, the economic loss reached several billion yuan, which seriously dampened the enthusiasm of shellfish farmers and caused the scallop culture to shrink. In recent years, with the decrease of scallop culture area and density, the improvement and rejuvenation of scallop germplasm, and the research and application of multi-species ecological culture model, the outbreak of scallop epidemic has weakened. Control measures of scallop seedling diseases: 1. Strict cleaning, selection and disinfection are carried out before the parent shellfish enter the pool, and daily inspection is carried out during the temporary breeding and ripening period to find the sick scallops in time; 2. There are a large number of deaths in the culture pond, so the dead larvae and pond water should be disinfected before abandoning the culture to avoid the spread of diseases; 3. Filter the seedling water and disinfect it with ozone or ultraviolet rays; 4. Feeding high-quality bait during the temporary rearing and maturity of parent shellfish to meet the requirements of accumulated temperature and ensure excellent egg quality; 5. Before seedling raising, the seedling raising facilities and instruments shall be strictly disinfected, and the instruments in each cultivation pool shall not be mixed; 6, selective culture after hatching; 7. Monitor the water quality regularly during seedling raising to ensure the water quality is fresh; 8. Before putting it in, strictly disinfect the attachment base. 9. Regularly examine the larvae under microscope for more than 2 times every day, and find signs of infection such as bacteria and fungi, and use antibiotics or antifungal drugs to control them in time; Prevention and control measures of scallop diseases in growth period: 1, multi-species ecological culture. 2, strengthen daily management, found dead shellfish found in time and brought ashore for harmless treatment, so as to avoid the spread of disease; 3. Before aquaculture, conduct a comprehensive survey of the aquaculture area to evaluate the aquaculture capacity; 4. Select high-quality seedlings, control the breeding density and avoid seedling shedding at high temperature; You can browse scallop net /special/show- 10.html, which contains a lot of information about cage culture in scallop net. You'd better consult an expert.