1.Center for Marine Ranching Engineering Science Research of Liaoning，Dalian Ocean University，Dalian 116023，China；2.Key Laboratory of Marine Bio-resources Restoration and Habitat Reparation in Liaoning Province，Dalian Ocean University，Dalian 116023，China；3.College of Fisheries and Life Science，Dalian Ocean University，Dalian 116023，China；4.Dalian Tianzheng Co.Ltd.，Dalian 116000，China；5.Fishery Technology Extension Station of Changhai County，Changhai 116500，China
Abstract: Germ cell genesis and gonadal development were monthly observed in mantis shrimp Oratosquilla oratoria collected in Pikou Bay in coastal Dalian from May 2014 to April 2015 by histological and ultrastructural technology to investigate the reproductive biology of the mantis shrimp population.The results showed that the ratio of female to male was similar to anticipated value 1∶1 in other months except for July（χ2=0.500，P＞0.05），range from 0.79 to 1.34，with annual mean value of 1.04±0.05.There was similar tendency of gonadal development between female and male，with two peaks of maturity throughout the year，May and November in female，and April and November in male，early development in male than in female.Oogenesis of mantis shrimp was divided into 7 stages：oogonium，primary oocyte，secondary oocyte，previtellogenic oocyte，vitellogenic oocyte，early mature oocyte and mature oocyte.And ovarian development was divided into non-developmental stage，primary oocyte stage，early growth stage，middle growth stage，late growth stage，pre-maturation stage，maturation stage and finally atretic stage.Correspondingly，the spermatogenesis was divided into three sages：spermatogonium，spermatocyte and sperm，while testis development was divided into four stages：spermatogonium stage，spermatocyte phase，early sperm and sperm phase.The findings provide a first step towards understanding of the reproductive biology of mantis shrimp，benefit for stock enhancement and aquaculture of mantis shrimp in the future.
2016, Vol. 31 
