Way to protect Vannamei Shrimp Hepatopancreas Health

Some vannamei farmers find these phenomena in ponds,which influences shrimp growth and shrimp health.

a). Shrimp's body muscles are whitish.

b). Shrimp body cramps.

c). Shrimp body bent towards the abdomen.

d). Shrimps are stiff and lose their ability to swim.

e). Shrimp soft shell.

The phenomenon of "white muscle" and "cramps" of P. vannamei mainly occurred in high-density shrimp ponds and high-temperature seasons. Like: water temperature above 28degrees; DOC 50-80; shrimp size120-140c/kg; Eutrophic and Deteriorated in water quality. Under these conditions, shrimp are easily infected.

The main symptoms of "white muscle" of shrimp: At the beginning of “”white muscle” of Vannamei, most of them are in the tail and abdominal muscles of shrimp. Especially the fourth to sixth sarcomeres of the abdomen become opaque, white and turbid, and some appear from the middle of the back. The cloudy part loses its transparency, and then spreads quickly to the entire abdomen. Shrimp in serious condition, whose whole back muscles are white and necrotic, cramping, sick shrimp are restless and strenuous exercise, some shrimp have a soft shell, an empty stomach, or even death. Microscopic examination of whitening muscle necrosis, muscle fiber disorder, and unclear stripes.

 Causes of shrimp "muscular turbidity" and "cramps"

a). Strong external stimulation

During the summer noon meal, the sun is violent. This is the most likely to occur at this time.

b). Shrimps are weak

Due to the weak liver and intestine function of prawns, inadequate feeding or poor feed quality, the prawns are weak and their anti-stress ability is very poor. In an environment where healthy prawns can grow normally, prawns with weak bodies are also prone to stress reactions.

d). Insufficient trace elements

The lack of trace elements such as calcium, magnesium and phosphorus in the water body can not meet the needs of shrimps for survival and growth.

e). The shrimp body has inflammation. Such as swollen gills, yellow gills, intestinal edema.

Shrimp organisms have inflammation, which will lead to poor nutrient absorption ability and physical decline, and eventually the symptoms mentioned in the first paragraph will appear.

f). Deterioration of pond bottom

Pathogens at the bottom of the pond multiply, which causes infection of shrimp pathogens. Pathogens are easy to cause white turbidity caused by muscle lesions.

Preventive measures for prawn muscle turbidity and cramps

a). Shrimp Seeds

Choosing high-quality seedlings with strong disease resistance, and the density of seedlings should match the breeding environment.

b). Improve water environment

Timely anti-stress treatment to reduce the stress response of shrimp. Avoiding too high levels of nitrite and ammonia nitrogen, causing stress in shrimp.

c). Supplement trace elements

Trace elements (vitamins, inorganic salts, etc.) are added to the feed or cultured water to fully supplement the nutrients required by the shrimp.

d). Pay attention to dissolved oxygen and avoid insufficient dissolved oxygen at the bottom.

Add pond oxygenation equipment in time, use chemical oxygenation agents such as calcium peroxide and potassium persulfate and other oxidizing bottom solutions to solve them.

e). Strong physique, resisting disease and stress

To enhance the disease resistance of shrimp, enhance the function of the liver and pancreas of prawns and protect the health of the liver and pancreas. Adding bile acid to the shrimp feed can effectively protect the liver and intestinal health of the shrimp, improve the anti-stress ability, and effectively prevent the shrimp from being muddy, enteritis, white stool, and stealing.