Prediction and forecast of aquaculture diseases in Sichuan Province in April 2021
By: Date: 2021-03-26 Categories: foodtechnology Tags: ,
  April is the breeding season for most freshwater carps, and it is also the period when aquatic products are planted in large numbers, but the temperature difference varies greatly, and the farmed fishes pass through the winter The physique is weaker and more susceptible to diseases. According to the monitoring of aquaculture diseases in Sichuan Province in recent years, it is necessary to focus on the following diseases and make preparations for prevention and control.

  1. Illness prediction

   (1) Cyprinus viremia:it can infect all carp sizes, and juveniles under 1 year of age are most susceptible. The water temperature is prevalent at 12-18℃ , Susceptible species include carp, koi, crucian, goldfish, etc. The main carp breeding areas and fingerling farms should focus on prevention and control.

  (2) Koi herpes virus:It can infect carp fry and adult fish. Once infected, the disease is rapid and the mortality rate is as high as 80-100%. The water temperature is 18-28 It is easy to be popular at ℃, and susceptible species include carp, koi and their variants. The main carp breeding areas and fingerling farms should focus on prevention and control.

  (3) Saprolegniasis:This disease occurs frequently and is widely distributed, and it can occur from fish eggs, fry to adult fish. Pond farming, circulating farming in ponds and high-density flowing water aquaculture are all distributed.

   (4) Gill rotten disease, red skin disease:mainly occurs in carp, crucian carp, grass, silver carp, bighead carp, perch, catfish and other cultured species, the whole province All are distributed.

   (5) Vitiligo syndrome:general water temperature is easy to break out when the water temperature is 18~30℃, the main hazards are Procambarus clarkii, etc. Crayfish breeding areas need to be focused Prevention and control.

  (6) Cucurbita vulgaris and Trichoderma:Mainly harm fry and fingerlings. Channel catfish, catfish, carp, grass carp and other cultured species and ornamental fish It can be parasitic and is distributed in every breeding area in the province.

   2. Prevention and control measures

   (1) Preventive measures

  1. Transfer adult fish through separate ponds in a timely manner, increase the processing volume of commercial fish, or adopt measures such as frozen preservation to reduce the amount of adult fish in storage ponds and reduce the density of pond culture. During operation, care should be taken to avoid injury to the fish body or cause stress reaction.

  2. Put healthy seedlings, buy quarantine qualified seedlings from a regular seedling farm, disinfect the seedlings before entering the pond to prevent pathogens from being introduced, Control the occurrence of diseases from the source.

   (2) Strengthen production management

  1. Thoroughly clear the pond:Eliminate silt, use quicklime, tea bran, bleaching powder, pyrethroids, sulphuric acid, etc. to clear the pond for disinfection, kill fish pests, etc. , To ensure a good growth environment;

  2. Adjust the pond water quality, set up aeration equipment at multiple points, regularly monitor and disinfect, and cultivate a”fat, refreshing, tender, and live” water body. Fish provide a good living environment, enhance their physique, and improve disease resistance.

  3. Reasonably set the breeding density, catch the large and leave the small in time, and standardize the operation when the seed is transferred to the pond and put into the pond to avoid the infection of pathogenic bacteria caused by the injury of the fish body, regularly Disinfect breeding tools;

  4. Regular insecticide and disinfection, do not add external water at will to prevent the introduction of disease sources.

  5. The water temperature rises and fish feeding activities increase. Gradually increase the feeding according to the feeding situation, and the increase is not more than 20%.