摘要
于2013年3月至2014年1月对岷江眉山段四川华鳊（Sinibrama taeniatus）的繁殖生物学进行了研究。四川华鳊的繁殖时间主要集中在4∽5月份,最小性成熟雌性个体体长70 mm,体重7.1 g;最小性成熟雄性体长为65 mm,体重为4.5 g。四川华鳊种群性比（雌︰雄）为1.00︰1.57,主要由4个年龄组组成,其中1龄个体数量占绝对优势。性成熟系数4∽5月份最大,同期丰满度最小。卵径（1.05±0.17）mm,大小分布呈单峰型,为单批产卵型鱼类。绝对繁殖力（2 734±258）粒,相对繁殖力为（236±20）粒/g,绝对繁殖力随着鱼体长、体重增长而增大。分析显示,选择适合的渔具、渔法对保护岷江眉山段四川华鳊自然种群资源十分重要。
Sinibrama taeniatus is an endemic fish in the upper Yangtze River, and distributes in Sichuan Province and Chongqing City, China. At present, due to the loss of habitat after the completion of the Three Gorge Project, Xiangjiaba Dam Project, and other hydroelectricity projects, it was forecasted that the population seizes of the endemic fish（S. taeniatus） might decreased sharply in the future. So, this paper describes and characterizes the reproductive biology of S. taeniatus in the Minjiang River, a first-order tributary river of the Yangtze River. 570 specimens were collected during March 2013 to January 2014 in Meishan section of the Minjiang River. The data for standard length, body weight, net body weight and gonad weight of each specimen, and eggs′ diameter of 60 females in Ⅳ stage were measured. The scale were mainly used to determine the ages. Egg diameters were measured with the Motic Image-Pro Plus 6.0 software. The gonads′ stage were divided into six stages according to YIN Min-Chen（1993）. Statistic analysis of all data were taken using Microsoft excel 2003 and SPSS 16.0. The results showed that the ages of the specimens ranged from 0 to 3 years old（Table 1） and the main spawning of S. Taeeniatus population took place from April to May. The minimus size of mature female was 70 mm in length and 7.1 g in weight, while that of mature male was 65 mm in length and 4.5 g in weight（Fig. 1）. The sex-ratio of females to males was 1.00︰1.57（χ2, P〈0.01）. The population included 4 age-groups and 1 year-old S. Taeeniatus reached their first sexual maturity. The gonadosomatic index（GIS） began to increase in March and reached to the peak in May（Fig. 2）. On the contrary, fullness decreased to the lowest in the same time（Fig. 3）. The distribution of eggs diameter shows one peak（Fig. 4）. The absolute fecundity, ranged from 301 to 8 789 eggs（average 2 734 ± 258 eggs） and the relative fecundity per gram, ranged from 15 to 1 003 eggs（average 236 ± 20 eggs）. The absol
出处
《动物学杂志》
CAS
CSCD
北大核心
2015年第4期563-570,共8页
Chinese Journal of Zoology
基金
水产科学重庆市级重点实验室开放课题
内江师范学院校级重点项目(No.13ZA02)
关键词
四川华鳊
繁殖生物学
资源保护
岷江
Sinibrama taeniatus
Reproduction biology
Resource conservation
Minjiang River
