How to choose the right fish nursery

To fertilize the fry pool, if you use the whole pool sprinkled, although the fertilizer effect is fast, but the role of time is short, many tiny fertilizer particles have not yet completely dissolved, easily eaten by the fry, affecting the survival rate. If the fertilizer is put into a plastic woven bag, it is hung into the fish seedling pond to allow it to dissolve and diffuse naturally, which not only has stable fertilizer effect, low cost and low labor intensity, but also can continuously provide nitrogen, phosphorus and other elements for phytoplankton and promote the growth and reproduction of phytoplankton. Provide a lot of peculiar natural food for fry, so as to improve the survival rate of fry. Methods as below:

First, hanging bag time. Should choose to be carried out between 9 am and 4 pm on a sunny day, when the light is strong, the temperature is high, the photosynthesis of phytoplankton is strong, and the effect is good.

Second, the type and amount of fertilization. Mixed with nitrogen and phosphate fertilizers. Nitrogen and phosphorus are indispensable nutrients for the growth and reproduction of phytoplankton. Commonly used nitrogen fertilizers are ammonium bicarbonate, urea, etc. Phosphate fertilizers include superphosphate, calcium magnesium phosphate, and so on. The depth of the fish pond is 1 meter, and 4 kg -5 kg ​​of ammonium bicarbonate and 4 kg of superphosphate are used per acre. Or urea 2 kg -3 kg and superphosphate 5 kg -6 kg, such as calcium magnesium phosphate fertilizer is 4 kg -5 kg. The specific dosage varies depending on conditions such as weather, water temperature, and water quality.

Third, the use of methods. Put the fertilizer in a bag and hang it in the fish pond to allow it to dissolve and diffuse naturally. About 4 plastic woven bags can be hung per acre, and nitrogen and phosphate fertilizers are respectively put into the bags and sunk to 20 cm below the water surface. Nitrogen and phosphate fertilizers must not be mixed in the same bag, because the nitrogen absorbs heat and dissolves fast, and the reaction with phosphate fertilizer will reduce the fertilizer effect. Phosphate dissolves slowly and can hang one or two bags, but it can't be bagged with nitrogen fertilizer at the same time. It is better to hang phosphate fertilizer in the morning and nitrogen fertilizer in the afternoon.

Fourth, the number of bags. It depends on the water quality. Usually 3 days - 5 days. When the pond is filled with new water, it is necessary to hang bags in time and increase the number of bags to be properly added. The use of hanging bag top dressing can increase the survival rate of fry to more than 50%. The fish fry has neat specifications and strong physique, and it also improves the utilization of chemical fertilizers.

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