Poor water quality: During the aquaculture process, organic substances such as remaining feed, dead animals and plants, dead algae, high-density crabs, and young crabs, will accumulate in the water and produce a large amount of ammonia, nitrite, and hydrogen sulfide. Harmful substances, when it exceeds the standard, inhibits the breathing of crabs, causing discomfort to crabs and juveniles, and does not want to go into the water. The improvement methods include appropriately diluting the stocking densities, regularly changing the amount of water or regularly using biological agents to improve the regulation of water quality such as PSB, EM stock solution and water purifying agent.
Nutrition is not balanced: In the breeding process, long-term nutrition is not balanced, the lack of vitamin trace elements causes the body's immune function to decline, resulting in physiological lesions. Control methods include: Feeding full-price compound feed, regular addition of appropriate amounts of Bactin, various B vitamins, VC, folic acid, niacin, inositol, choline chloride and fat-soluble A, D, E , K3 and so on.
Bacteria and virus invasion: such as Bacillus, Vibrio, Pseudomonas, control methods are: optional topical bromine chlorine, dibromo preparation, the whole pool with 2 times to 3 times, oral administration of terramycin and other antibacterial drugs .
Infections: such as strawworms, polyps, worms, larvae, larvae, etc., which are often accompanied by fine hairs (can be found only after a slight microscopic examination), are unresponsive, have slow motion, difficulty breathing, and reduce feeding. , Feet and weakness, body surface and appendix have a sense of creamy, prevention methods are: to strengthen feeding management, reasonable stocking, and maintain good water quality is the key. Can choose the market to reflect the better carapace net, fibrin net and other agents for continuous treatment l ~ 2 times, the next day can choose to external use bromine chloride, dibromide whole pool with 2 times to 3 times, can be significantly reduced The shore caused by this reason.
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