A kind of method for promoting maturation of broodstock gonads of spothead fish

Abstract

The invention relates to a method for promoting maturation of gonads of broodfish of barhead fish, belonging to the field of seawater culture. The water temperature of conventional culture is lowered by 0.5 ℃ to 17 ℃ every day. The light cycle starts from the conventional 12 hours of light and 12 hours of darkness every day. The light time is reduced by 20 minutes and the darkness is increased by 20 minutes. When the photoperiod of hourly light and 14 hour dark is maintained for 5-10 days; the temperature of the culture water is reduced by 0.5°C to 14°C every day, and the light time is reduced by 30 minutes and the darkness is increased by 30 minutes. When the daily light cycle becomes 8 hours of light 16 During the hourly dark photoperiod, maintain it for 5-10 days; reduce the culture water temperature by 1°C to 12°C every day, and maintain the culture water temperature at 12°C; reduce the light time by 60 minutes and increase the darkness by 60 minutes every day. During the 6-hour light and 18-hour dark photoperiod, it was maintained continuously.

Description

technical field [0001] The invention relates to a method for promoting gonad maturation of broodfish, in particular to a method for promoting gonad maturation of barhead fish, a method for fish fertilization rate and hatching rate, especially a method for improving the fertilization rate and hatching rate of barhead fish. Background technique [0002] Spothead fish (Hexagrammos agrammus) belongs to Scorpaeniformes, family Hexagrammidae, and genus Hexagrammos. It is a cold-temperate bottom fish in the coastal waters. It is mainly distributed in Japan, the Korean Peninsula and the Northwest Pacific Ocean. China's Bohai Sea, Yellow Sea, and East China Sea have obvious aggregation behaviors. They are cold-temperate bottom-dwelling fishes in the coastal waters. Spotheads often live mixed with Otaki Hexaline around rocky reefs or in shallow water algae areas. They are very promising for development in Chinese seas. One of the economic fish species. Its tender meat, delicious tast...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic spothead fish basically rely on fishing, and the relevant researches on spothead fish are mostly focused on its growth, feeding, nutrition and other biology and fishery resources. The technology of artificial breeding spothead fish seedlings has not been reported yet.

Due to the lack of natural resources of spothead fish and no breakthrough in artificial breeding technology, it is impossible to carry out cage culture in the north, and it also limits the development of recreational fishery

The technical bottleneck of artificial breeding of spothead fish is mainly the inability to artificially obtain broodstock with mature gonads, so that a sufficient amount of fertilized eggs cannot be obtained

The reason is that most creatures in nature spawn in spring when the temperature warms up, while barhead fish spawn in autumn and winter. The traditional method of fish gonad maturation is not suitable for barhead fish at all.