Breeding strategy of Acrossocheilus fasciatus in the Puxi Stream of the Huangshan Mountain

Breeding strategies of Acrossocheilus fasciatus were studied from 592 specimens collected monthly during May 2007 and April 2008 in the Puxi Stream of the Huangshan Mountain. Sex ratio of the studied population was 0.90 ： 1 （ ♀ ： ♂ ）, not significantly different from 1 ： 1. Both sexes reached their first sexual maturity at age 2 （the second calendar year of their birth）. Fifty percent of females and males reached maturity at a total length of 69.75 mm and 69.36 mm respectively, and the minimum total length was 61.54 mm and 58.96 mm, respectively. Based on the monthly changes in gonado-somatic index and egg- development process, the breeding season of the population was from May to August, with one obvious interval （in June） occurring in the breeding activity for the females. The nonsynchronous development of oocytes observed in mature ovaries indicated that A. fasciatus is a batch spawner. Absolute fecundity of A. fasciatus ranged from 308 to 2002 eggs with a mean of 857 eggs, increased significantly with total length, and was significantly different among three age groups. Relative fecundity ranged from 38.63 to 71.70 egg/g with a mean of 53.29 egg/g, and was not significantly different among the three age groups. It was suggested that these reproductive characteristics were adaptive strategies for A. fasciatus to acclimatize to lotic water where environmental factors were unstable but predictable [ Current Zoology 55 （5） ： 350 - 356, 2009].

百姓百言

第九届黄山节，好!发出这样的赞叹不是对政府的拍马。而是经过纵向比较之后的心声。当然，并不是说今年的黄山节已经“十全十美”了。为什么说今年的黄山节好？其一，不扰民。由于办节决策者的理念转变，市政府没有调集三区四县的警力，来对付想象中的“刁民”。中心城区的主要干道．也没有像往年那样五花大绑，层层设限，只是进行了必要的交通管制，防止出现混乱。