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[Objective] This paper aimed to summarize the results of the lenok reproduction in a hatchery, including growth of the artificially bred lenok, artificial propagation and fry rearing. [Method] Lenok (Brachymystax lenok) collected at wild were fed with pelleted feed and cultured to maturity in a flowing-water pond. The broodstocks were hormonally induced to spawn, and fry were reared from 2003 to 2010 in order to obtain a suitable and reliable method for the mass production of lenok juveniles. The embryos were hatched at accumulative temperature of up to 180-213 day degree at water temperature of 8-10 ℃. [Result]The results showed that 68%-85% of success rate was obtained with the eyed rate (fertilizing rate) of 32.8%-83%, hatching rate of 56.5%-87%, and emerging rate of 59.9%-90%. The fry developed into swim-up stage 10-12 days post-hatching. There were no significant differences in growth rate, fecundity and the eyed rate in the cultured lenok from those of the wild lenok. [Conclusion] Mass fry production of lenok could be achieved by hormonally induction.
[Objective] This paper aimed to summarize the results of the lenok reproduction in a hatchery, including growth of the artificially bred lenok, artificial propagation and fry rearing. [Method] Lenok (Brachymystax lenok) collected at wild were fed with pelleted feed and cultured to maturity in a flowing-water pond. The broodstocks were hormonally induced to spawn, and fry were reared from 2003 to 2010 in order to obtain a suitable and reliable method for the mass production of lenok juveniles. The embryos were hatched at accumulative temperature of up to 180-213 day degree at water temperature of 8-10 ° C. [Result] The results showed that 68% -85% of success rate was obtained with the eyed rate (fertilizer rate) of 32.8% -83%, hatching rate of 56.5% -87%, and emerging rate of 59.9% -90%. The fry developed into swim-up stage 10-12 days post-hatching. There were no significant differences in growth rate, fecundity and the eyed rate in the cultured lenok from those of the wild lenok. [Conclusi on] Mass fry production of lenok could be achieved by hormonally induction.