High-survival-rate propagation method of larimichthys polyactis fries in low-salinity sea areas

Abstract

The invention discloses a high-survival-rate propagation method of larimichthys polyactis fries in low-salinity sea areas and belongs to the technical field of seawater fish fry rearing. The method ischaracterized by including following steps: 1), adjusting salinity of a spawning pond; 2), collecting fertilized eggs; 3), separating high-quality fertilized eggs; 4), hatching the fertilized eggs; 5), desalting breeding water, and managing the fries. By the method, impact on embryonic development even death during embryonic development caused by the fact that the high-quality fertilized eggs inthe spawning pond sink to the bottom due to low water salinity can be avoided effectively, and easy collection of the high-quality fertilized eggs is facilitated. By lowering salinity of a nursery pond at a specific rate, normal growth and development of newly-hatched fries can be realized with lowest impact, and highest survival rate is ensured.

Description

technical field [0001] The invention belongs to the technical field of breeding seawater fish fry, and in particular relates to a method for breeding small yellow croaker fry with high survival rate in low-salinity sea areas. Background technique [0002] The fertilized eggs of small yellow croaker are floating eggs. When the seawater salinity is above 26, the fertilized eggs float on the upper layer of the water body. At this time, the fertilized eggs can develop normally. If the seawater salinity is low, the fertilized eggs cannot float, which will greatly affect the fertilization The normal development of eggs leads to the death of a large number of fertilized eggs. According to the survey, the salinity of seawater in different regions sometimes has great differences. For example, there are great differences in salinity in different sea areas along the coast of Zhejiang. The salinity is between 17-22. In addition, the salinity of seawater in the sea area near Xihugang, X...

AI Technical Summary

Problems solved by technology

[0002] The fertilized eggs of small yellow croaker are floating eggs. When the seawater salinity is above 26, the fertilized eggs float on the upper layer of the water body. At this time, the fertilized eggs can develop normally. If the seawater salinity is low, the fertilized eggs cannot float, which will greatly affect the fertilization The normal development of eggs, which in turn leads to the death of a large number of fertilized eggs

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