Improve the water color of eel pond
In the process of culture, the water color of the pond is changeable, indicating that a large number of phytoplankton die, rotifer, daphnia and other zooplankton increase rapidly, dissolved oxygen and PH value decrease, harmful gases increase, eel feeding decreases, floating head appears, resulting in disease and death. The improvement methods are as follows:
1. Light green becomes transparent: this phenomenon is the mass reproduction of zooplankton rotifer and daphnia. Trichlorfon 0.5ppm plus potassium permanganate 2ppm can be used to kill excessive rotifer and daphnia, or a large amount of water change treatment; 12-20 bighead carp with more than 500g/tail are stocked per mu to adjust water quality.
2. Turbid and slightly yellow water: water quality has deteriorated, so it is necessary to replace pool water, reduce bait dosage, apply compound fertilizer or urea, promote phytoplankton reproduction, and add new water at the same time.
3. The water color of the pool is dark brown green: at this time, the water quality has aged, and zeolite powder or quicklime can be sprinkled in the whole pool to replace part of the water.
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Identification of eel seedling varieties
At present, it is the Yangtze River eel seedling flood season, Jiangsu, Zhejiang, Anhui, Fujian, Shandong and other provinces and cities fishing vessels gathered in the Yangtze River Estuary fishing. Because the eel seedlings produced in the Yangtze River are "Japanese eels", it is better than "European eels" produced in France, "American eels" produced in the United States, "Australian eels" produced in Indonesia and Australia and "Filipino eels" produced in the Philippines. There is not only obvious difference in price, but also suitable for breeding in our country. In order to avoid being deceived by farmers in buying eel seedlings, the characteristics and identification methods of all kinds of eel seedlings are introduced as follows: first, the body color of Japanese eel seedlings is
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Adhere to the "Siding" bait to raise high-quality fish
Quality is required to feed the bait to be fresh and palatable, non-decay, good nutrients, easy to be digested and absorbed by fish. Grasses should be sterilized, manure should be fermented, and hard and coarse fodder should be chopped or processed. The monthly feeding quantity should be determined according to the water temperature, fish growth and feed supply. The daily feeding amount depends on the season, water color, weather and fish intake, which is generally calculated as 2% or 5% of the fish stock in the pond. It can also depend on the eating condition of the fish, such as throwing grass at 8: 9 a.m.
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