December 2010 Zhejiang Aquaculture Bulletin

In December 2010, the monitoring data of aquaculture diseases in Zhejiang Province was sourced from 11 cities including Hangzhou, Jiaxing, Huzhou, Shaoxing, Wenzhou, Taizhou, Ningbo, Zhoushan, Jinhua, Lishui, and Cangzhou; and the measured area was 62,869 acres of ponds and ponds, and the reservoir was 18316. Mu, beach 9711 acres, sea cage 227640.92m3, freshwater cage 39200m2, flow culture 113000m2, greenhouse 136287.5m2, rod cultivation 7310 acres, 900 acres of aquaculture farming; start and end time is 2010.12.1-2010.12.31.

This month, there are reported species of grass carp, squid, squid, black squid, channel catfish, large yellow croaker, American redfish, seven-star squid, squid, herring, squid, sunfish, red mouth squid, squid, squid, South American white There were 27 shrimps such as prawns, green prawns, three-ported crabs, blue crabs, crabs, clams, scallops, loach, clams, clams, oysters, and seaweed. The average disease incidence rate was 25.09% for grass carp gill disease in reservoirs. The average mortality rate for each disease is low.

In December, 5 out of 27 farmed species monitored in 11 cities across the province suffered from diseases (two fewer than the same period of the previous year, and three varieties decreased year-on-year). A total of 12 diseases were detected (1 month on the month and 3% year-on-year). ) Of these, there are 6 bacterial diseases, 1 fungal disease, and 5 other species. The total economic loss was 27,285 yuan (a decrease of 68.62% compared with the previous period, a decrease of 89.2% year-on-year).

Fish: Diseases of 2 of 15 varieties were detected, and 5 diseases were detected, mainly grass carp gill disease, erythroderma disease, red bark disease of carp, hydromycosis, enteritis, and bird damage. Among them, the average incidence rate was higher in reservoirs of grass carp gill disease, which was 25.09%; the average mortality of each disease was lower.

Crustaceans: Three diseases were detected in five species, and the incidence was lighter.

Shellfish: None of the five species had developed disease.

Algae: The rotten vegetables disease was detected in the alpine porphyra. The average incidence rate was 2.05%, and no death was caused.

Reptiles: There was no disease in ponds. Five diseases were detected in greenhouses, mainly red-neck disease, genital exposure, ammonia poisoning, putrefaction, ulcer syndrome, etc. Each disease was lighter.

In January, the continuous influence of strong cold air and the arrival of small and big chills, the temperature and water temperature continued to decline. It is expected that the incidence of disease and mortality of aquatic animals will be very low, but the majority of farmers still can not relax, it is necessary to strengthen the management of wintering, Do a good job of freezing and freezing. To this end, the following suggestions are made for reference by farmers and producers:

1. Science feeding. As the feeding ability of the cultured species is reduced, the amount of feeding should be reduced accordingly; the concentrate should be fed properly, and vitamins and immunopotentiators can be added to the feed to enhance the body and improve immunity.

2. Be careful. With the advent of the Spring Festival, when entering the busy season for the listed fish, the net and transportation will be more frequent. The farmers should pay attention to fishing operations to prevent fish injuries. In addition, healthy fingerlings should be selected, disinfection should be done before stocking, and care should be taken during stocking to avoid mechanical damage.

3. Strengthen management. Appropriately deepen the water level to minimize the impact of low temperature on cultured organisms; greenhouse cultivation should be done well in the work of insulation and water quality control, and splash yellow yellow powder and other Chinese herbal medicines to prevent diseases in the water, and also to reinforce in advance, prepare emergency materials to prevent snow disasters on greenhouses. damage.

4. Clean and disinfect. For all cultured ponds that have been arrested, clearing and repairing of ponds, dams, and ditches should be done; dry ponds should be cleared of sediments and exposed to sunlight in order to maximize the killing of pathogenic organisms and lay a good foundation for the cultivation in the coming year.

5. Scientific medication, standardized medication. Adhere to the principle of "prevention first, prevention and control combined". The prevention of drug use in the breeding process and the drug treatment of the affected individuals must strictly comply with the state's provisions on the use of fishery drugs, so that the scientific use of drugs, standardized drug use, for the upcoming aquaculture species must comply with the relevant provisions of drug withdrawal period, To ensure the safety of aquatic products.