Novel soilless breeding method of leeches

Abstract

The invention relates to a new method for breeding leeches through fresh water soilless net cages and belongs to the technical field of aquatic animal breeding.Top openings of the net cages are closed, the net cages are fixed to a fresh water supporting object, a certain distance is kept among the net cages, 100-500 artificial bred juveniles with the average body weight being 10 mg are thrown for each net cage bottom face area of 0.5m<2>, after the average body weight of the juveniles is larger than 500 mg, the juveniles are transferred to nets to be bred continuously, or 20-200 wild juveniles with the average body weight being 0.5-4 g are throw for each net cage bottom area of 0.5 m<2>; during breeding, main food is thrown according to the amount which is 20 times of the body weight of the leeches, the food is updated periodically, and after being bred for 60-120 days, the leeches are directly poured out and harvested.The average weight of the leeches exceeds 20 g, and the size meets the use standard of the medicinal leeches.The method is easy to operate, lands are not occupied, the food resource includes natural planktons except snails, the net openings are closed to prevent natural enemies, and the method saves cost and is high in economic benefit.

Description

[0001] This application is a divisional application for the invention patent with the patent number 201310471482.4. The filing date of the original application is October 11, 2013, and the application number is 201310471482.4. It is a new soilless culture method named as a leech. technical field [0002] 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 [0003] Wide-body golden leech (scientific name: WhitmaniapigraWhitman) 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". Efficacy, modern medicine shows that: leeches have a good effect on 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 amou...

AI Technical Summary

Problems solved by technology

[0004] 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.