Directly increasing rotifers in ponds is an effective way to solve the problem of opening the bait, reduce production costs, and improve the survival rate and quality of fry. The main points of its technical operation are described as follows: 1. Drainage clear pond: Rotifers re-emerged from resting eggs in the sediment. It has been determined that there are more than 10 million rotifer dormant eggs per cubic meter of sediment in the ponds of fishery fertilizers, which are the "seeds" for the reproduction of rotifers of the year. Drainage can increase the heat of the dormant eggs in the sediment. Clear ponds can clear the rotifer's predators. The replacement of fresh water itself is a benign stimulus to dormant eggs. Therefore, when the average water temperature is 20-25°C, clear ponds can be drained with about 100kg of quicklime per 667m2 (1 mu), and after 8-10 days, rotifers can appear in large numbers. The relevant tests show that the daily consumption of 26 kg of cow dung or human waste per 667 square meters of pond can meet the food needs of rotifers. Pond mud can also be lifted by adding 1% quicklime to increase the number of resting eggs in the pond water. Shortly after the occurrence of rotifers on the pond, otters began to appear, as both ate bacteria, rot and algae, and the filter capacity of leeches was stronger than that of rotifers. If there were many leeches, rotifers would have Lack of food is inhibited. With crystals of trichlorfon formulated at a concentration of 0.5 mg/L, the whole pool is spilled to kill leeches and retain rotifers. Using the above method to control leeches and apply organic fertilizer, the rotifer peak period can be extended from the natural state of 3 - 5 days to 15 - 20 days. When the environmental conditions are suitable, the rotifers reproduce very quickly. After reaching the peak of 1-2 days, it is prone to adverse conditions such as lack of oxygen. If it is not improved, the rotifers will quickly emerge dormant eggs and terminate breeding. Refilling with fresh water will reduce the density of rotifers in order to facilitate the peak period of rotifers.
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2. Organic Fertilizer:
3. Control enemy damage:
4. Add new water: 
