Age,growth and reproduction of Sarcocheilichthys nigripinnis from the Qingyi Stream in the Huangshan Mountains  

作　　者：Yunzhi YAN Yinsheng XU Ling CHU Shan HE Yifeng CHEN 

机构地区：[1]College of Life sciences,Anhui Normal University,Provincial Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province,Wuhu 241000,China [2]Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China

出　　处：《Zoological Research》2012年第S01期25-31,共7页动物学研究（英文）

基　　金：National Basic Research Program of China(2009CB119200);Natural Science Foundation of China(31172120);Anhui Provincial Natural Science Foundation(090413080)。

摘　　要：Identifying the life-history strategies of fish and their associations with the surrounding environment is the basic foundation in the conservation and sustainable utilization of fish species.We examined the age,growth,and reproduction of Sarcocheilichthys nigripinnis using 352 specimens collected monthly from May 2009 to April 2010 in the Qingyi Stream.We found the sex ratio of this study population was 0.58:1(female:male),significantly different from expected 1:1.Females and males both comprised four age groups.The annuli on the scales were formed during February and March.No obvious between-sex difference was observed in length-weight and length-scale-radius relationships.The total length in back-calculation significantly increased with age for both sexes,but did not differ significantly at each age between the two sexes.An inflection point was observed in the growth curves given by the von Bertalanffy growth function for total weight.At this inflection point,fish were 3.95 years.Both sexes reach their 50%sex maturity at age 2,when females and males were 94.7 mm and 103.0 mm total length.The temporal pattern of the gonado-somatic index corresponded to a spawning period that occurred from April through July.The non-synchronicity of egg diameter in each mature ovary during the breeding period suggested these fish may be batch spawners.The absolute fecundity increased significantly with total length and weight,whereas no significant correlation was observed between the relative fecundity and body size.

关 键 词：Sarcocheilichthys nigripinnis Age structure Annulus formation Sexual maturity Spawning period Reproductive investment 

分 类 号：R73[医药卫生—肿瘤]