Ichthyosporidium (ichthyosporidiumhoferi)
Signs of infection show that the fish looks thin, but the abdomen is swollen. Especially in the late stage of the disease, when small white nodules appear on the skin, skin defects occur. The infected fish swim abnormally. Affected fish ichthyosporidia infect many kinds of freshwater and marine fish. The disease is not as common as thought, because it is easily confused with very similar symptoms caused by tuberculosis in fish.
Infection is a fungal disease that spreads through the body and severely damages internal organs. The growth cycle is quite complex. Infection begins with spores ingested by copepods that are caught as bait, or spores that remain on open wounds. Fungi cultured in the laboratory grow actively at 3: 20 ℃, and 10 ℃ is the most suitable for growth.
The recommended treatment is unlikely to succeed if Ichthyosporidium enters an advanced stage. But it is possible to save newly infected fish. Bait immersed in phenoxyethanol can successfully treat the disease. The powerful substitute is amphotericin, a virtually insoluble antibiotic that is mixed with food at a rate of 100mg per kilogram of food and fed 1% of body weight every day. Some people have tried to raise the temperature to 38 ℃, but it cannot be recognized as a proven treatment. If you have to destroy the fish, make sure that the aquarium and all equipment are thoroughly sterilized before you can use it again.
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Cultivation of parent Fish of Autumn Grass
The sex cells of grass carp are in the period of growth and development in autumn and winter. the quality of feeding and management at this stage directly affects the gonadal maturation, the effect of spawning in the second year, and the fertilization rate and hatching rate of fish eggs. For this reason, the cultivation of grass carp should be grasped from the following points in autumn and winter. 1. Prepare the fish pond. To cultivate grass parent fish ponds, it is required to be close to the spawning pond and have good water sources. The area of the fish pond is generally 340 mu and the water depth is 1.5 meters. Before parent fish are released, fish ponds should be cleaned, ridges should be repaired, weeds should be removed, and drugs such as quicklime or bleach should be used.
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Breeding technique of Boleophthalmus mandshurica in soil pond
Turtle fish is a kind of fish with warm water, wide temperature and wide salinity. Its meat tastes delicious, has the effect of nourishing and strengthening the body, and is deeply loved by the coastal people in Zhejiang, Fujian, Guangdong, Taiwan and other provinces and the Japanese, so the market demand is very large and the price is expensive. Due to the gradual decline of the resources of the big fish, the culture of the big fish was started in the southeast coast of China in the 1980s. Because the fish has the characteristics of short food chain, less fish disease, long-distance transportation of live fish, easy to master culture technology, low culture cost and high economic benefit, so it has the characteristics of short food chain, less disease, long-distance transportation, easy to master culture technology, low culture cost and high economic benefit.
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