Affected by the region, the cultivation of leeches in northern China should establish a sunlight overwintering greenhouse under artificial conditions to break their overwintering habits, increase the cultivation time and shorten the market cycle. In the cold and snowy season, snow removal and artificial warming measures should also be taken. Advanced greenhouses can be made of plastic steel without columns, but the cost is relatively high.
Through the construction of solar greenhouses, we will focus on the big and the small in a planned way and concentrate on wintering. In daily management, we should pay close attention to the temperature changes inside and outside the greenhouse, as well as the ability of oxygen, wind and cold resistance to ensure the normal growth and overwintering of leeches and prepare enough leeches for the coming year.
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The natural bait species are mainly freshwater snails, earthworms and some insects, and various animal blood, viscera, freshwater fish, shrimp, shellfish, compound feed for livestock and crop straws are added in large-scale culture.
A certain number of wild snails or Amphibia canaliculata can be put into pond culture, and the number is generally about 0.05-0. 1kg/ m2, which is beneficial to their natural reproduction and growth and feeds on leeches.
Don't release too many snails. If there are too many, they will compete with the main varieties for living space, and the subject and object will change hands. When feeding animal blood or mixed bait, we should pay attention to feeding at intervals and remove the remaining bait in time, especially in hot weather, so as not to pollute and destroy the water quality and affect the growth of leeches.