SHARING HOW TO IDENTIFY SHRIMP INFECTED WITH SLOW-GROWTH EHP DISEASE
Question: Is EHP disease contagious? Is there a way to identify shrimp infected with EHP?
How to identify shrimp infected with EHP slow-growth disease
*Enterocytozoon hepatopenaei* (EHP) is an intestinal pathogen affecting both whiteleg shrimp and black tiger shrimp in aquaculture. EHP was first reported in 2016 in farmed whiteleg shrimp in Venezuela. EHP damages the intestinal walls, causing slow growth. It also infects the hepatopancreas tubules in shrimp, damaging organs that absorb nutrients from food.
Salinity affects EHP infection rates
In practice, EHP is more common in commercial ponds with high salinity (>15 parts per thousand (ppt)) compared to those with low salinity (<5 ppt). Since whiteleg shrimp are euryhaline (capable of surviving in both low and high salinity), scientists have conducted experiments to see if EHP can infect shrimp under low salinity conditions.
The experiment results indicate that shrimp feces are one of the main sources of EHP transmission. EHP transmission can occur at salinities below 2 ppt; however, the infection rate, speed, and severity are higher in ponds with high salinity, typically between 25–30 ppt.
Identifying EHP in shrimp through observation
If you lack access to reliable lab services or facilities in your farming area, you can still visually assess the likelihood of EHP infection in your shrimp through careful observation and monitoring for the following signs:
- Thin epidermis under the shell, and the shell itself may also be thin.
- White muscle tissue due to ongoing stress caused by EHP.
- Black spots on the eyestalks, in the muscle tissue, and along the hindgut.
- Slower-than-normal growth rate.
- Reduced appetite, with no increase in food intake over time.
- Delayed molting and minimal growth following molting.
Source: VPAS
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Ngày đăng : 16/11/2024
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