Prevention and Control of Common Diseases of Tanglouse
First, rotifer: a large number of rotifers (hard to observe with the naked eye) attach to the Gill filaments, destroying Gill tissue, affecting respiration, and asphyxiation of fish fry. Prevention and control method: ① per cubic meter of water with 0.5g of copper sulfate and 0.2g of ferrous sulfate (can also be used only 0.7g of copper sulfate) dissolved in 40 ℃ of warm water and sprinkled all over the pool. ② per cubic meter of water is sprinkled with 0.5 g dissolved water containing 50% desenamine in the whole pool.
The second and third generation worms and ring disease: these two kinds of worms attach a large amount to the Gill and secrete a large amount of mucus, which hinders the breathing of fish fry. The main symptoms are Gill edema, hyperemia is dark, and there is a lot of mucus in the Gill. This disease often occurs in the high temperature season. Prevention and treatment methods: ① per cubic meter of water body with 10 grams of potassium permanganate solution to wash fish fry 10ml 15 minutes (water temperature 25ml 30 ℃), immediately after washing, add new water or replace more than half of the pond water. ② per cubic meter of water with 90% crystal trichlorfon 0.2g, baking soda 0.1g mixed dissolve the whole pool, apply again every two days.
Water mildew and Gill mildew: diseases caused by molds invading the body surface and Gill tissues of fish. The diseased fish has a white mouth and a white tail, the serious body surface is in the shape of "white hair", and the Gill filaments are pale and unable to swim. The disease occurs when the water temperature is low at the end of early spring and autumn, or when the skin of fish fry is injured after transportation or sieving. Prevention and treatment: 0.2 grams of malachite per cubic meter of water, 5 grams of baking soda and 50 grams of salt are dissolved and sprinkled in the whole pool, once a day for 2 consecutive days.
Fourth, bacterial enteritis: feeding unclean or deteriorated feed, getting sick by bacterial infection, sick fish tendrils, anorexia, fish blackening, swimming alone, severe abdominal swelling, or even mass death within a day or two. Prevention and treatment: can be fed with "Yubikang" mixed feed, 200 grams of medicine for every 50 kg of fish, once a day for three consecutive days. One gram each of erythromycin, chloramphenicol, furazolidone and 20 grams of salt can also be mixed into sticky feed once a day for 3 consecutive days. If fish anorexia is found, every cubic meter of water should be sprinkled with erythromycin and furazolidone 0.5 grams of dissolved water, once a day for 2 consecutive days.
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Key points of breeding parent fish in spring
After the beginning of spring, the water temperature gradually increased, especially in the prenatal stage from March to April, the fish activity strengthened, developed rapidly, and the food intake also increased. This stage is an important period of gonadal development of parent fish. Practice has proved that the cultivation of parent fish in spring is the key to the success or failure of artificial reproduction of domestic fish, so we must pay attention to the following points: first, bait grass parent fish mainly feed grass and concentrate. According to the source of the grass, the grass is usually fed on a fixed table in the morning and concentrate in the afternoon. Early spring green feeding
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Key points of adult fish management after autumn
After autumn, the water temperature begins to drop, and fish eat gradually, which is also the golden period for fish production and growth. Management should be strengthened. Specifically, the following points should be mastered: First, strengthen feeding. At this time, feeding should be based on concentrate, focusing on the fattening of fish at the bottom. At the same time, attention should be paid to the variety matching of concentrate and coarse feed to ensure that fish feed nutrition is full and comprehensive. Grass carp should be properly fed grass, herring should be fed snail feed, etc. Silver carp should also be properly fertilized. After autumn, the amount of fertilizer should be applied less frequently, and inorganic fertilizer should be the main fertilizer.
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