Method for promoting Miichthys miiuy sexual gland maturity

Abstract

The invention discloses a method for promoting fish gonad maturity, which employs comprehensive adjustment of water temperature adjustment, light emitting adjustment and nutrition adjustment and technology preventing clit insect. The gonad of fish cultured from late February to early March and adjusted with said comprehensive adjustment matures more than one month earlier than that of in natural condition, and gonad of parent fish cultured in the middle October and adjusted with said comprehensive adjustment is about four months earlier than that of in natural condition, which advances fish breeding time. The fecundity is increase in Zhejiang province, the quality of ovum and sperm is improved, the fertility rate is 62.5%, rate of hatchability is 60.1%, and seeding survival rate is 15%.

Description

technical field [0001] The invention relates to the reproduction technology of marine fishes, in particular to a method for promoting the gonad maturation of gonads. Background technique [0002] Miiuy (Miichthys miiuy (basilewsky), also known as black scorpion, belongs to the order Perciformes, the family Scrotoaceae, and the genus scorpion. It is an important economic fish with a high market price, especially its isinglass. It is a high-grade tonic, which is deeply loved by people; due to the very small output, it is only eaten in hotels and restaurants, and it is difficult to see goat in the general market. [0003] Angler is a 4-year-old sexually mature fish. Because of its gonad development and maturity period, the gonad is usually after October, so its breeding season is from October to December every year, and it is a fish that breeds in autumn and winter; The gonad matures relatively late. Even under artificial breeding conditions, it usually takes 40-50 days from s...

AI Technical Summary

Problems solved by technology

[0002] Miiuy (Miichthys miiuy (basilewsky), also known as black scorpion, belongs to the order Perciformes, the family Scrotoaceae, and the genus scorpion. It is an important economic fish with a high market price, especially its isinglass. It is a high-end tonic, which is deeply loved by people; due to the very small output now, it is only eaten in hotels and restaurants, and it is difficult to see scorpion in the general market

[0003] Angler is a 4-year-old sexually mature fish. Because of its gonad development and maturity period, the gonad is usually after October, so its breeding season is from October to December every year, and it is a fish that breeds in autumn and winter; The gonad matures relatively late. Even under artificial breeding conditions, it usually takes 40-50 days from spawning to fry growing to 3 cm. In this way, it takes 12 days for the fry to go to the sea for large-scale fingerling cultivation in cages. At the end of the month, the seawater temperature is only 8-10°C. Under low temperature conditions, 3cm fry seldom or stop feeding, and their ability to resist low temperature is also weak. It is difficult for most fry to survive the long and severe winter. The overwintering survival rate of the prawns is very low, less than 3%; if it is allowed to stay indoors to cultivate and survive the winter, firstly, it will be heated up and managed manually, but the cost is very high; It is easy to perish, fish diseases occur frequently, and the survival rate of fry is not high, and it is also lower than 5%.

The artificial large-scale breeding of squid requires batches of large-scale fish species, and fry reaching 5 cm or more can adapt to changing environmental conditions. However, it is difficult to breed large-scale fish species in batches with existing technologies, which restricts the industrialization of squid farming.