A few days ago, the author was invited to go to several townships in the vicinity of Xiangjiang City, Hunan Province for fishery research and came to the Yangge Village of Yangge Village, Xinwan Town, Yuanjiang City. The farmer Wang Jialian reported that several of his batches of the yellow cricket had died in the middle of transportation. The loss is greater. Ask why and how?
At the scene, he listened to Wang Jialian's detailed introduction. After careful observation and analysis, the author told him that Huang Wei had a "fever". Astragalus "fever" occurs mainly during high-density farming and long-term transportation. Due to its high density and long transportation time, the surface mucus is decomposed and fermented by microorganisms in the water, and a large amount of oxygen is consumed and heat is released, resulting in a sharp increase in water temperature, making the bottom yellow trout. Struggling together to death in groups, the mortality rate can reach 90%.
Solution: store a few days before transportation, change the water frequently, as far as possible to eliminate the body surface, mouth sediment and excrement in addition to the net; during transport, according to the temperature level, master the water change time, temperature 23 °C ~ 30 °C, each Change the water completely every 6~8 hours, the temperature is high, and the time interval for changing the water will be shortened accordingly; when antibacterial drugs are applied, 1.2 million units of penicillin will be put into every 100 kilograms of water, which will play a preventive role. When ponds or cages are cultured with scutellaria baicalensis, a reasonable stocking density should be grasped, a small amount of loach should be mixed, eaten with residual baits, and moved upstream and downstream through the loach to prevent them from intertwining. If a "fever" occurs, 0.7 grams of copper sulfate per cubic meter of water may be used to splash the entire pool (box), or use 100 grams of green onions, 50 grams of salt, and 15 grams of mulberry leaves per cubic meter of water. 2 times, use 2 to 3 days.
Recently revisited Wang Jialian. He was pleased to say that according to the above method, there was no problem with the shipment of Huanghua, and the survival rate was high and the effect was good.
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