Method for controlling synchronous maturity of brook trout and rainbow trout

Abstract

The invention discloses a method for controlling the synchronous maturity of brook trout and rainbow trout. The method comprises the following steps that female rainbow trout and male brook trout are cultured in a separated mode; when the ovaries of the female rainbow trout are developed to the end of the III period and the beginning of the IV period, stimulation by running water is conducted for 2 hours one time every 3 days, and the water temperature in a culture pond is decreased to 6 DEG C; meanwhile, the average sunlight irradiation time of the male brook trout is adjusted to 5.8 hours, the male brook trout is subjected to sunlight irradiation one time every day, and stimulation by the running water is conducted for 6 hours one time every day; the female rainbow trout is fed with fresh fish one time every week; the male brook trout is fed with the fresh fish one time every day, the female rainbow trout is fed with commercial feed two times every day, and the male brook trout is fed with granulated feed two times every day. By means of the method, the synchronous maturity rate of the brook trout and the rainbow trout can be increased to 85.7%, it is ensured that the amount of the rainbow trout is enough for hybridization, and the method is beneficial to popularizing the hybridization breeding work of the brook trout and the rainbow trout.

Description

technical field [0001] The invention relates to the technical field of hybrid breeding, in particular to a synchronous maturation control method for colorful salmon and rainbow trout broodstock. Background technique [0002] Rainbow trout (Oncorhynchus mykiss) belongs to the Salmonidae Salmonidae genus. It is native to the mountain streams along the western Pacific coast of North America. It lives in freshwater waters all the year round. one. Rainbow trout was originally classified as Salmo, but its taxonomic status was changed from Salmo to Oncorhynchus in 1988. Rainbow trout has the characteristics of fresh and tender meat, delicious taste, no fishy smell, no intermuscular spines and comprehensive nutrition, especially rich in highly unsaturated fatty acids EPA (eicosapentenoic acid) and DHA (docosahexaenoic acid). It has been widely introduced and domesticated, and has now spread all over the five continents of the world. It has become one of the most widely distributed...

AI Technical Summary

Problems solved by technology

[0004] At present, many units have tried to use colorful salmon and rainbow trout for hybrid breeding. Among them, the orthogonal seedlings (colorful salmon male and rainbow trout female) have undergone growth, disease resistance tests and morphological measurements. They have fast growth and strong disease resistance. The characteristics of high phenotype similarity with the female parent, but the sexual maturity of the seven-colored salmon male and the rainbow trout female is not synchronized, which has become an important factor restricting its cross-breeding work

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