The leeches refer to the two major classes of zooplankton, such as aquatic cladocera and copepods, which are rich in nutrients and easy to digest. They are palatable foods for fry and fingerlings. Artificially cultivated otters feed on fish at low cost, and fish grow fast, which has a good yield increase effect. The method is:
First, build the pool. Earthen ponds and cement pools are available. The depth of the pool is about 1 meter, and the size is 10 square meters to 30 square meters.
Second, water injection. The pool is about 50 cm deep. The suitable water temperature of the leech is 18°C ​​to 25°C, the pH is 7.5~8, and the dissolved oxygen saturation is 70%~120%.
Third, fertilization. Each cubic meter of water in earthen ponds is cast with 4 kg of cattle, horse dung or other livestock manure, 1.5 kg of straw, wheat straw or other non-toxic plant stems and leaves as base fertilizer. After 10 days, topdressing is performed once. The amount of topdressing fertilizer is the same as base fertilizer. Keep the color of the water brown. The cement pool will cast 1.5 kilograms of cattle, horse dung or other animal manure per cubic meter of water, and add 1.5 kg to 2 kg of fertile soil. After that, the fertilizer will be topdressed once every 8 days. The topdressing amount will be cattle, horse dung or other livestock manure. 0.75 kg.
Fourth, nurture. Whether it is an earthen pond or a cement pond, a mixture of yeast and inorganic fertilizer can be used. For each cubic metre of water, 20 grams of yeast is inoculated. The yeast can be soaked in water for 3 hours to 4 hours before being poured into the pool. 65 grams of ammonium carbonate and 37.5 grams of ammonium nitrate per cubic meter of water are applied. After every 5 days, the yeast is applied. Once, the dosage is half of the beginning. After the yeast is put in, the water is exposed for 1 to 3 days, and then the water fleas can be used for seeding. The amount of seeds used is 30 g to 50 g per cubic meter of water.
V. Fishing. After 15 days to 20 days into the pool, the species of leeches can be covered in the entire pond after extensive breeding. At this time, feed fish in batches. Generally every 1 day ~ 2 days to fish once, once the total amount of 10% to 20%. In the water temperature of 18 °C ~ 20 °C environment, you can often fishing, continuous.
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