Novel soilless cultivation method of leeches

Abstract

The invention relates to a novel soilless cultivation method of leeches, and belongs to the technical field of cultivation of aquatic animals. According to the method, top openings of net cages are closed, the net cages are fixed to fresh water holders, a certain distance exists between every two net cages, 100-500 artificially-bred seedlings of which the average weight is 10mg are thrown in each net cage of the base area being 0.5m<2>, after the average weight of the seedlings is greater than 500mg, and the seedlings are transferred into another net cages to continue being cultivated, or 20-200 wild seedlings of which the average weight is 0.5-4g are thrown in each net cage of the base area being 0.5m<2>; main food of the weight being 20 times that of the leeches is thrown in the cultivation process, the food is updated regularly, and the leeches are directly poured out to be harvested after being cultivated for 60-120 days. The average weight of the leeches exceeds 20g, and the size of the leeches reaches the use standard of medical leeches. The method is easy to operate, land is not occupied, food resources include natural planktons besides main snail food, the openings of the net cages are closed to prevent natural enemies and the like, and the method saves cost and is high in economic benefit.

Description

technical field [0001] The invention belongs to the technical field of aquatic animal breeding, and in particular relates to a new soilless breeding method for leeches. Background technique [0002] Wide-body golden leech (scientific name: Whitmania pigra Whitman) is a traditional precious Chinese medicinal material. It is one of the main base animals of the medicinal material leech included in the 2010 edition of "Chinese Pharmacopoeia". As a result, modern medicine has shown that leeches are very effective in treating stroke, high blood pressure, and blood clots. However, due to environmental pollution and overcapture in recent years, the wild resources of leeches are increasingly depleted, and the amount of medicines is increasing day by day, resulting in a shortage of leeches. Artificial breeding of leeches is imperative. [0003] In order to adapt to the living and breeding habits of the leeches, the artificial breeding of the leeches is mostly carried out in paddy fie...

AI Technical Summary

Problems solved by technology

[0003] In order to adapt to the living and breeding habits of the leeches, the artificial breeding of the leeches is mostly carried out in paddy fields and farmlands, but this kind of breeding method is easy to make the leeches penetrate into the soil, making it impossible to catch them all, resulting in economic losses. At present, high-density industrial soilless artificial culture and semi-artificial cage pond culture technology are widely used

It is difficult to adjust the high temperature and water temperature in high-density industrial soilless artificial culture in summer, and the leeches grow slowly, and it is easy to miss the growth period of leeches. However, the semi-artificial cage pond culture technology, because the bottom layer is filled with soil, is also difficult for cleaning, changing water, and harvesting. There are many disadvantages. The above two breeding techniques still have bait species that rely on artificial feeding, and the variety is single, resulting in unbalanced nutrition of leeches, and the artificial production is limited in water area and insufficient dissolved oxygen, which brings disadvantages to the growth of leeches.