The cultivation of aquatic fingerlings is commonly referred to as “flowering,†which is the first important link in fish production. Aquatic fish fry body is small and tender, and it is poor in adaptability to the environment. It is a little careless and will cause a large number of deaths. The following points need to be made in production:
Dredging and disinfecting is used for flowering ponds. Before the fish is released, the pool water should be drained about half a month before the fish is cleared to remove debris from the pool. After the sun is exposed for a few days, thick mud will be picked up. The bottom of the pool is reserved 3 cm to 5 cm. Thickness is appropriate. Then, 60-80 cm of new water is poured, and 100-120 kg of lime is used to clear the pond with water, killing the harmful organisms and germs on the fry.
The practice of letting water for planting water for many years has proven that not only does the emergence of fertilizers and waters not only have high survival rates, but also the growth of fish fry is fast and consistent. Generally after the disinfection of clear ponds 3 days - 5 days to the pond by the fermentation of large manure, about 100 kilograms per acre. After about 7 days of fertilization, the food rotifers in the pool water will reach a peak, and the fry can be released at this time.
The test-water seedlings are to test whether the toxicity of the disinfectant in the pool water disappears the day before the seedlings are released. The method is to use a large washbasin full of pool water, put dozens of tail water fish fry, 6 hours-8 hours after the fry are still normal activities, indicating that the drug residue has disappeared, you can put seedlings. If abnormal fish fry or death is found, it indicates that the residual drug of Qingtang has not completely disappeared, and the fish should be released after the toxicity completely disappears.
The ponds are eaten and eaten by the ponds. The fry which was bought back from the ponds is required to be “sitting pots†before being transported. The method is to use small fish pots (or large plastic pots, etc.) to hold a small amount of water and use oxygen bags. Return the fry slowly into the pot and allow it to return to normal. Then use one cooked egg yolk per 100,000 fry. Gently pour it into the fish bowl after the water is fine, and let the fry eat. . When the ponds are to be tested by hand, whether the water temperature in the fish bowl is the same as the water temperature in the pond, if there is a significant difference in the hand feel, it is necessary to adjust the temperature. Otherwise, the fish will be caught in the lower pond due to a temperature change, resulting in a large number of deaths. The temperature adjustment method is: use a bowl or cup to dip the water in the pool into the fish bowl, add a bowl (cup) every few minutes, and add the bowl into the basin when the water temperature in the basin is nearly the same as the water temperature in the pool. Into the pond. When laying seedlings, it should be noted that windy weather should be placed in the windward winds of ponds, windless weather should be released in deep water, and fish should be prevented from falling from a height to the pool. Fish ponds should be moved into ponds. Hold the side of the pond by hand and tilt the bowl to allow the fish to swim gently into the pond. On sunny days with higher temperatures, do not put seedlings at noon.
Grasp the density of single fish fry flower density should not be too dense, not too thin, generally green, grass fry seedlings to put 100,000 acres, oysters, oysters and other fry put 120,000 -15 million tails is appropriate. Fish fry flowers should only be raised in a single way and cannot be polycultured, otherwise it will affect the survival rate and the specifications will not be neat.
Strengthen the management of pond fish ponds in accordance with the time after ponds according to the pool of fertilizer, in line with the principle of a small amount of ground facilities, timely application of decomposed manure, or spilled milk, to ensure that the fry have enough food. Adhere to early, middle and late inspections. Walk around the pool every morning and use a washbasin to catch fish and observe its growth and activity. As the fry grows, fresh water is added every 5 days to 7 days, and the depth of water injection is about 5 cm. After 15 days to 20 days of floriculture, the fry can grow to 2 cm to 3 cm, which should be diversified into ponds to reduce the occurrence of diseases, accelerate the growth of fry and increase the survival rate. The fry flowering stage coincides with the Meiyu season. During this period, the fry is prone to whiteheads, trichotomosis, and white skin disease. We must pay attention to water quality management and do a good job of drug prevention. If a fish disease occurs, the cause must be quickly identified and the medicine should be prescribed.
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