沱江宽体华鳅繁殖特性  

Reproductive Characteristics of Sinibotia reevesae in the Tuojiang River

作　　者：王永明[1] 谢碧文[1] 王芳[1] 岳兴建[1] 王淯[1] 齐泽民[1] 吴英[2] 申绍祎 

机构地区：[1]内江师范学院生命科学学院长江上游鱼类资源保护与利用四川省重点实验室特色农业资源研究与利用四川省高校重点实验室,内江641112 [2]内江市第六中学,内江641000

出　　处：《动物学杂志》2014年第5期699-706,共8页Chinese Journal of Zoology

基　　金：四川省教育厅重大培育项目(No.09ZZ012);四川省省属高校科研创新团队项目(No.KYTD201009);四川省科技支撑项目(No.2011NZ0075)

摘　　要：对2010年4~11月采集于沱江资中段的573尾宽体华鳅（Sinibotia reevesae）进行了繁殖特性研究。结果表明：宽体华鳅性腺发育分为6期,5月卵巢发育到Ⅳ期,精巢发育到Ⅴ期。繁殖期在5~8月,盛期为6~7月,可通过胸鳍和生殖孔差异辨别性别。繁殖群体雌雄性比为1∶1.15,2~3龄性成熟,性成熟最小年龄两性均为2龄,为补充群体占优势的繁殖群体。雄性（Ⅴ期）最小性成熟个体体长71 mm,体重5.43 g,成熟系数4.76%,雌性（Ⅲ期）最小性成熟个体体长76 mm,体重7.80 g,成熟系数1.46%。成熟卵巢中卵子大小基本一致,卵径分布为单峰型,属于单次产卵类型;繁殖群体体长76~120 mm,体重7.80~41.60 g;卵小,沉性,野生条件下胚胎发育需要流速较快的流水环境。Sinibotia reevesae is an endemic fish which lives only in the upper reaches of the Yangtze River. The present study describes the reproductive characteristics of S. reevesae in the Tuojiang River,a tributary river of the Yangtze River. A total of 573 specimens were collected from Apirl to November 2010 in Zizhong section of the Tuojiang River. Method： Standard length,body weight and gonad weight of each specimen,and eggs＇ diameter of 30 females in Ⅳ stage were measured. The specimen＇s ages were identified using lapillus＇ s abrasive disc. The gonads were divided into six stages as described by LIU Yun（ 1993）. Statistical analysis of all data was conducted using Microsoft excel 2003 and SPSS 19. 0. Results： In April the testis and the ovary were both in stage Ⅱ. From May to August,stage Ⅳ,Ⅴor and Ⅵ ovary and testis were found,and in September bothovary and testis degenerated to stage Ⅱ（ Table 1）. The spawing of S. reevesae population took place from May to August,mainly in June and July,and the sex could be distinguished between pectoral fin and cloaca（ Fig.1）. The sex-ratio of reproductive population of female vs. male was 1∶ 1. 15. Two or three years old S. reevesae reached their first sexual maturity,and the spawning stock mainly consisted of age 2,3,4 and 5 groups（ Table2）. Standard length,weight,gonadal stage and gondosomatic index（ GSI） of males at minimum maturity were71 mm,5. 43 g,stage Ⅴ and 4. 76%,respectively,and those of females minimum maturity were 76 mm,7. 80 g,stage Ⅲ and 1. 46%,respectively. The distribution of eggs＇ diameter showed one peak（ Fig. 2）. Standard length,weight of reproductive population ranged from 76 mm to 120 mm and from 7. 80 g to 41. 60 g,respectively（ Table 3）. These imply that S. reevesae spawns from May to August,especially in June and July,and has a single period of spawning a year. The eggs of S. reevesae are small and sinking,and their embryonic development must be in fast flowing river.

关 键 词：宽体华鳅 繁殖特性 沱江 

分 类 号：S917.4[农业科学—水产科学]