Raise seedling method on scale for freshwater shrimp

Abstract

The invention relates to a large-scale method for raising seedlings of freshwater shrimps, which mainly comprises the following steps: the mixture ratio of female shrimps to male shrimps is between 3 and 5 to 1, and the shrimps come from different places, are more than 4.5 centimeters, have mature gonad, are able-bodied and scot-free, and have sensitive reaction to external stimulus; or shrimps with eggs and more than 5 centimeters are directly purchased in the mating period, taken as parent strains and placed into a seedling pool; high-quality full-rate mixed feed is thrown and fed from the next day; when zoeas occur in the pool, soybean milk is splashed; when shrimp larvaes begin to be abnormal, powdery mixed feed is fed when the soybean milk is splashed simultaneously; and when the proportion of abnormal seedlings is improved, the proportion of the powdery mixed feed is gradually increased and the powdery mixed feed can be completely thrown and fed after 10 days. Moreover, the transparency of a water body is controlled to between 20 and 30 centimeters; the pH value is between 7.5 and 8.5; and the dissolved oxygen is more than 5 milligrams per liter. The method is a scientific, reasonable, low-investment, high-efficiency and large-scale method for raising the seedlings of the freshwater shrimps, can effectively prevent varieties from degeneration, and is favorable for promoting good freshwater shrimps and improving the economic benefit of cultivation.

Description

technical field [0001] The invention relates to the reproductive biology and seedling raising technology of giant macrobrachium, in particular to the technical fields of reproductive biology of freshwater shrimp, selective mating of parent shrimp, large-scale seedling raising, water quality regulation and shrimp seedling fishing. Background technique [0002] Freshwater shrimp (Macrobrachium nipponense), scientific name Japanese river prawn, commonly known as river shrimp, lake shrimp. Its meat is tender, delicious and nutritious. It is a famous and precious aquatic product loved by the masses, and it is also 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 degener...

AI Technical Summary

Problems solved by technology

Variety degradation has become the bottleneck of the freshwater shrimp farming ind