The testes of pseudobagurs fulvidraco ( richardson ) can be divided into two parts . the anterior part is spermatogenic part where spermatogenesis proceed . the posterior part of it is the seminal vesicle , which can store sperms and produce large amount of fluid during spawning season . at the end of april , the spermatogenic part of the testes , which is at stage , begin the initiation of spermatogenesis . in may , the spermatogenic part of the testes , which is at stage ， starts active spermatogenesis . from june to novermber , the spermatogenic part is at stage , and spermatogenesis is actively proceeding . from december to the beginning of next april , the spermatogenic part is at stage . the wall of the lobulus is made up of cystes of spermatogonia throughout the whole winter time 黄颡鱼的精巢从外形上分为上、下两段.上段为生精部，下段为贮精囊.性成熟黄颡鱼精巢的生精部为小叶型结构，其周年变化经历如下过程：期?期?期?期?期. 4月下旬开始生精活动的启动.生殖季节为5 7月， 5月生精部处于期. 6 7月生精部处于期，产生大量精子. 8 11月虽非生殖季节，生精部仍进行生精活动. 12月至翌年4月，生精部处于期，并以期精巢过冬.贮精囊在生殖季节分泌活动旺盛，产生大量分泌物
