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....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].展开更多
A new barbine cyprinid fish, Acrossocheilus multistriatus sp. nov., is described from the Zhujiang River （Pearl River） basin in South China. It is separated from all other barred congeners except A. monticola by its...A new barbine cyprinid fish, Acrossocheilus multistriatus sp. nov., is described from the Zhujiang River （Pearl River） basin in South China. It is separated from all other barred congeners except A. monticola by its unique coloration pattern of 8-12 vs. 5-7 vertical dark bars on the dorsum and flank. Although 8 vertical black bars are also present in specimens ofA. monticola, the new species is distinct from it by having a well-developed （vs. poor-developed） lower lip, with or without a median interruption （vs. with a median interruption which wider than 1/2 mouth width） on lower jaw, the lower jaw entirely covered （vs. uncoverd） by the lower lip, body depth 22.57%-25.22% SL （vs. 25.64%-32.26% SL）. Additional characteristices as follows： last simple dorsal-fin ray soft without serration; dark stripes on membranes between dorsal-fin rays; dark stripes absent on membranes between anal fin rays; maxillary barbels longer than eye diameter, extending to posterior edge of eyes.展开更多
基金by National Basic Research Program of China(2009CB119200)Anhui Provincial Natural Science Foundation(090413080)Natural Science Foundation of Anhui Education Bureau(KJ2009A110,KJ2008B211)
文摘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].
基金supported financially by Kadoorie Farm&Botanic Garden,Special Fund for Agro-scientific Research in the Public Interest(201303048)the National Natural Science Foundation of China(31372178)Permission for fieldwork was granted by the Guangxi Provincial Forestry Department
文摘A new barbine cyprinid fish, Acrossocheilus multistriatus sp. nov., is described from the Zhujiang River （Pearl River） basin in South China. It is separated from all other barred congeners except A. monticola by its unique coloration pattern of 8-12 vs. 5-7 vertical dark bars on the dorsum and flank. Although 8 vertical black bars are also present in specimens ofA. monticola, the new species is distinct from it by having a well-developed （vs. poor-developed） lower lip, with or without a median interruption （vs. with a median interruption which wider than 1/2 mouth width） on lower jaw, the lower jaw entirely covered （vs. uncoverd） by the lower lip, body depth 22.57%-25.22% SL （vs. 25.64%-32.26% SL）. Additional characteristices as follows： last simple dorsal-fin ray soft without serration; dark stripes on membranes between dorsal-fin rays; dark stripes absent on membranes between anal fin rays; maxillary barbels longer than eye diameter, extending to posterior edge of eyes.
