[ 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...[ 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 ma- turity 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 suit- able 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 （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.展开更多
基金supported by Special Fund for Agro-scientific Research in the Public Interest(Grant no. 201003055)the National Science and Technology Supporting Plan(Grant no. 2012BAD25B10)National Science and Technology Plan of the Twelfth Five-Year for the Rural Development in China(Grant no. 2012BAD26B05)
文摘[ 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 ma- turity 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 suit- able 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 （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.
