Under the natural ecological conditions, Astragalus has strong vitality and resistance to disease, but under artificial breeding conditions, due to the increase of the breeding density, it is easy to cause diseases. It is difficult to observe the early stages of the onset of jaundice. Once the symptoms are obviously difficult to cure, squid aquaculture should adhere to prevention and control.
1. Plum spot. Early on the wound or near the weak anal fistula, small red spots appear, and then expand into round or oval spots of bean size. In severe cases, the tails are completely rotted and float on the water surface to die. Control methods: often put a few larvae in the squid pool, the use of its body secreted venom, can effectively kill the bacteria.
2. Fever. In the case of high-density feeding, the speed of mucus secretion by the astragalus is accelerated, and if the water change is not timely or there is a dead angle when changing the water, high heat will be released due to mucus fermentation, causing the body temperature of the jaundice to rise. Sick and entangled with each other, the body surface mucus off, the head swollen, dry. Control methods: reduce the stocking density, increase the amount of mud in the pool, use the loach to eat the remaining bait, and can use it to roll up and down, reduce the jaundice winding. In addition, pay attention to changing the water.
3. Skin mildew. The disease was caused by the excessive stocking density and insufficient feed and caused the killing of the jaundice. The diseased fleas had mycosis hyphae, and the physique was thin, with little feeding and eventually died of exhaustion. Control methods: Use salt and baking soda which account for 10,000 times of the weight of the pool water (each 1/2 mix well). Add water to dissolve and sprinkling the whole pool.
4. Hairy nematode disease. Jaundice suffers from this disease more commonly, mainly by the parasitic nematode parasites in the intestinal mucosal layer, destroying the intestinal wall tissue, causing inflammation of the intestinal wall. Illness is thin and the appetite is greatly reduced. In severe cases, jaundice is often struggling. Control methods: Use 10% of 90% crystal trichlorfon per 100 kg of Astragalus, mix 3 kg of bean cake, and make it into pills. Feed continuously for 3~5 days.
5. Hypoxia. This disease mostly occurs in high temperature weather, due to the high temperature in the Dianchi Lake and the high oxygen consumption, which results in lack of oxygen in the Dianchi Lake. At the same time, due to the high temperature of the water, the Astragalus can not probe the air, causing the Astragalus to probe frequently outside the hole, causing the body to breathe. Disorders, eventually failing to die. Prevention methods: regular patrol pool, random inspection of carcasses, Dianchi water quality, once the disease, immediately change the water, and with the sediment to enhance oxygenation measures.
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