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 technical operation points are now described as follows: Drainage clear ponds: The rotifers re-germinate on 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 acre, which can occur in large numbers after 8-10 days. 2. Application of organic fertilizer: The relevant tests show that the daily consumption of 26 kg of cow dung or human waste per mu 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. 3. Control of predators: Shortly after the occurrence of rotifers on the pond, leeches also began to emerge, as both feed on bacteria, decay, and algae, while leeches have a stronger filter-feeding capacity than rotifers. If there are many leeches, Rotifers are suppressed due to lack of food. 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. 4. Filling with fresh water: When the environmental conditions are appropriate, the rotifers reproduce very quickly. After reaching the peak one to two days, it is prone to adverse conditions such as lack of oxygen. If no improvement is made, the rotifers will soon appear to rest eggs and terminate. Breeding, new water should be added at this time so that the density of rotifers can be appropriately reduced to facilitate the continuation of the peak period of rotifers.
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