Method for increasing black shrimp culture commodity rate

Abstract

The method for increasing commodity rate of breeding black shrimps in the invention includes selecting excellent seeds, postponing the time of shrimp postlarvae stocking properly and feeding some chubs, bighead carps, etc., controlling the coverage rate of float grass and the transparency of water, and making use of calces. When in the metaphase of breeding black shrimps, more particularly, when the black shrimps are in the propagation season of Autumn, the area of float grass is controlled to be 60-70% of the water area, the transparency is controlled to be 40-50cm. In the propagation season, when the color of oogenesis of shrimps becomes grey and transparent, or flea-shape larva is hatched out, calces of 10-20g per stere is used for spraying the whole pool within five days, then the method is used every week and is totally used for 7-10 times. By increasing the measures of controlling the coverage rate of float grass and the transparency of water and making use of calces, neoteny of black shrimps and over propagation are controlled, the growth of grown shrimps is promoted, and the commodity rate of black shrimps can reach 90% at the end of the year. The method of breeding black shrimps has the advantages of easy and convenient operation as well as easy popularization and use, etc., which is a good method for effectively increasing commodity rate of breeding black shrimps.

Description

technical field [0001] The invention relates to the reproduction of aquatic animals and the ecological control of the water environment, and in particular to a breeding method for raising the commodity rate of the freshwater shrimp by technologies such as the reproduction of the freshwater shrimp, the planting of aquatic plants, and the regulation of water quality. Background technique [0002] Green shrimp (Macrobrachium nipponense), scientific name Macrobrachium nipponense, is an important freshwater cultured shrimp in my country. At present, the annual output of freshwater shrimp farming in my country is more than 200,000 tons, and it is still increasing year by year. However, with the continuous expansion of the breeding scale and the continuous improvement of the degree of intensification, the freshwater shrimp has serious species degeneration, early sexual maturity, smaller individuals, lower listing rate, more diseases, and lower breeding benefits year by year. To so...

AI Technical Summary

Problems solved by technology

On the one hand, due to the accumulation of nutrients in the gonad development of precocious green shrimp, the growth is slow, the size of commercial shrimp is relatively small, and the market price is low; When the size increases, the larvae and adult shrimp compete for food, oxygen, and space, resulting in the size of the adult shrimp being unable to increase, the commodity rate is reduced, and the commodity price is greatly reduced, which directly affects economic benefits

In order to promote individual growth and improve the specifications and commercial rate of finished shrimps, measures such as selecting high-quality seedlings, appropriately delaying the stocking time of shrimp seedlings, and rationally raising silver carp and bighead carp are mainly adopted. Although they can play a certain role, the effect is still not ideal. , so, how to control precocious puberty and overbreeding of freshwater shrimp has become an urgent problem to be solved in production