What is the reason why freshwater shrimps die in large numbers in cold air?

Hello! First of all, the green shrimp is likely to suffer from molting syndrome. The following is to introduce the causes and prevention of molting syndrome.

Symptoms: after death, the shell is soft, the body turns red, the gills are yellow or white, and some are accompanied by sporadic black spots. Because this clinical symptom occurs after the prawn molts, it is called "molting syndrome".

The disease has a sudden onset, wide epidemic range and high mortality. Every year from August to June, 65438+ 10, especially after mid-September, cold air invades and the temperature drops suddenly, which is easy to break out.

Etiology: There are many inducing factors of the disease. When the wind blows, the pool water becomes turbid; Sudden rainstorm, sudden change of physical and chemical factors of water body; Large water exchange and unstable water quality; The weather suddenly turns from mild to cold, and then the temperature suddenly rises, or the rainy weather suddenly turns violent, and so on. These changes in climate and environment lead to stress response and a large number of molting of prawns. If the dissolved oxygen is low after molting, it will die of hypoxia; When the bottom quality is poor and the content of ammonia nitrogen, hydrogen sulfide and nitrite is high, it will be poisoned and die; If the water quality deteriorates and the pathogen density is high, it will be infected and die. In some diseased shrimp ponds, the dissolved oxygen is less than 2 mg/L during the day, and in some cases, the dissolved oxygen at the bottom is still less than 3 mg/L. It is generally found that toxic gases such as ammonia nitrogen and hydrogen sulfide exceed the standard, resulting in the death of prawns. Adult shrimps are 3 ~ 8 cm long, and the time is from April to June, 65438+ 10 month every year, especially from August to 65438+10 month.

Prevention and treatment: There are many causes of ecdysis syndrome, and the treatment should be based on the above causes.

Then, it is also possible that you have soft shell disease.

The etiology of the disease is still unclear, and it is suspected that it is related to germplasm degradation, adverse environmental conditions and nutritional deficiency.

Symptoms: After molting, the new shell of the freshwater shrimp is weak and not hard. After a period of time, the freshwater shrimp dies, and some of them die after trying to molt, often accompanied by broken limbs and rotten whiskers, which can cause a large number of deaths when exposed to cold air.

Prevention: from June 5438+00 to June 5438+0 10, the feed is supplemented with nutritional Chinese and western medicines such as FRC- vitality source, immune king and VCE for a long time to enhance the physique of the freshwater shrimp; Sprinkle hard shell treasure in the pond to meet the minerals needed by the green shrimp to molt.

Treatment: spray hard shell treasure 1 ~ 2 times in the whole pool, and then disinfect it with 0.3 ~ 0.4 ppm of biquaternary ammonium iodine for 2 ~ 3 times, which can generally be cured.

That's all I know. Happy New Year! Early success in raising shrimps! Get rich by raising shrimps! !