Winter is a good time for regular fish feeding, but if it is not properly handled, it can easily cause it to become infected with water mold.
Saprolegosis is mainly caused by crowding, movement or other adverse environmental factors, and the body surface tissue is injured. The aquatic spores of aquatic fungi are waiting to attach to the necrotic tissue and begin to germinate to form hyphae. Apart from parasitism in necrotic tissue, hyphae can also spread into nearby normal tissues, secrete digestive enzymes to decompose the surrounding tissues, penetrate the dermis deep into the muscles, make the skin and muscles necrotic and disintegrate, and eventually lead to necrosis of tissue cells in the wounds of fish species. Loss of appetite, a large number of deaths. The prevention and control methods are now described as follows:
1. Thoroughly clear the pond. Remove excess silt and sprinkling with 20-30 kg/mu of quicklime or 0.3-0.5 g/m3 of water or 200 ml/mu of sterile aqueous solution. 2. Reasonably control the stocking density of seedlings, especially those with hard spines and hard thorns. 3. When the nets are transported and stocked, the operation should be meticulous, and the fish should not be injured. It is best to marinate with water for 15 to 20 minutes. 4. Strengthen feeding and management, improve seedling immunity and resistance. For every 10kg of fish, 0.3 to 0.6g of vitamin E was used, fed twice a day and fed for 3 days. 5. Prevent low temperature cold wave. Deepen the water level in the pond, increase the temperature of the insulation material or warm it for the winter. 6. The broodstock is injured. It can be applied with 10% mildewin plus Vaseline to make ointment.
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