DEALING WITH SOFT PEELED SHRIMP SHELLS AND DROPPING FLESH IN SHRIMP
Shedding (molting) is a normal physiological phenomenon of crustaceans. In order to grow, crustaceans are forced to shed their old shells and form new ones. To prevent soft peeled shrimp shells, it is imperative to eat sufficiently, fully absorb nutrients, and mobilize blood calcium from the hepatopancreas source.
Shrimp usually peel in the evening, in the period from 10 p.m. to 2 p.m. For white-leg shrimp, the shelling is concentrated on the middle days of the month (the 13th, 14th, and 15th) and the last days of the month (the 29th and 30th). During this time, it is necessary to add enough minerals for shrimp to absorb and harden the shell quickly. In the case of shrimp that molt but the shell does not harden, shrimp are very susceptible to environmental shock and infection, which can lead to mass death, causing heavy damage to the culture.
Causes and Effects of soft peeled shrimp shells and dropping flesh
- When soft peeled shrimp shells happen, shrimp are susceptible to disease-causing factors, causing shrimp to die, because, at this time, shrimp’s resistance is very weak and susceptible to pathogens in the aquatic environment.
- Due to nutrition: shrimp lack vitamins and minerals, especially calcium and phosphorus. When shrimp molt, the shell will usually harden after 4-6 hours, but if it does not provide enough necessary minerals, the shell will be soft and thin.
- Dirty pond bottom: the accumulation of pathogenic factors for shrimp: toxic gas NH3-NO2, lack of bottom oxygen, harmful bacteria… Shrimp peeled often hide in the pond bottom, so they will be exposed. directly with these pathogens.
- Low salinity, few minerals in the water: at this time, the toxicity of NO2 will be higher than normal.
- High-density farming: when shrimp peel, they will collide and stab each other, causing shrimp to die.
- Algae collapse and decay: contaminating the water environment and pond bottom, creating a favorable environment for pathogenic factors to develop, affecting shrimp.
Dealing with soft peeled shrimp shells and dropping flesh in shrimp
- Provide enough minerals for farmed shrimp.
- Feed at a moderate density.
- Good water quality management: stabilize the density of algae, shrimp feed, and waste, reasonably maintain water parameters such as salinity, dissolved oxygen, toxic gases…
- Biological measures: using microbial products to treat the water supply and the water environment during the rearing process to stabilize water quality, inhibit harmful bacteria, and supplement beneficial bacteria to handle the excess organic matter.
PROPOSED SOLUTION FROM THAI NAM VIET
To ensure the health of shrimp when they start peeling, farmers need to create a favorable environment for them. Treat the water environment carefully, so the bottom of the pond is clean before the shrimp start to peel, by checking the water environmental indicators to take appropriate treatment measures. Using microbial products to treat water and pond bottom in order to stabilize water quality, inhibit harmful bacteria, handle harmful factors such as toxic gas… In addition, it is necessary to add minerals to the environment. water field for shrimp to fully absorb minerals to help shrimp shells harden quickly.