雅砻江中游厚唇裸重唇鱼的繁殖特性与种群增长潜力
Reproductive characteristics and population growth potential of Gymnodiptychus pachycheilus in the middle reach of the Yalong River
李筱芹 1曾如奎 2倪达富 1哈西 2任军全 1徐丹 2田辉伍 3万卓坤 1梁嘉峻 1付梅 1姚维志 1吕红健1
作者信息
- 1. 西南大学水产学院,农业农村部长江上游水生生物多样性保护研究中心,西南大学渔业资源环境研究中心,重庆 400715
- 2. 雅砻江流域水电开发有限公司,四川 成都 610000
- 3. 中国水产科学研究院长江水产研究所,湖北 武汉 430223
- 折叠
摘要
为研究雅砻江中游厚唇裸重唇鱼(Gymnodiptychus pachycheilus)的繁殖特性与种群增长潜力,本研究于 2020年 10 月至 2022 年 5 月在四川省甘孜藏族自治州内的新龙县至雅江县江段采集厚唇裸重唇鱼样本 248 尾,对其进行繁殖特性分析.结果显示,248尾厚唇裸重唇鱼样本中性腺发育达Ⅱ期的样本数量最多(n=143),其次是I期(n=66),未采集到性腺发育达 Ⅵ 期,即产卵或排精后的样本;雄性和雌性样本的平均性成熟系数分别为(5.21±0.93)％和(4.75±0.87)％;平均卵径为(2.14±0.30)mm;产卵类型属单峰一次产卵型;平均绝对繁殖力和相对繁殖力分别为(9054±2310)粒和(6.56±0.69)粒/g,其中绝对繁殖力与体长、体重之间呈显著正相关关系(P<0.05),但与性腺重无显著相关关系(P>0.05);182 尾性别可辨样本的雌雄性比为 1.49:1,雌雄性最小性成熟个体的年龄均为 4 龄.考虑该物种本身繁殖特性的限制,以及栖息地演变与人为干扰等因素对种群增长的不利影响,初步推测雅砻江中游厚唇裸重唇鱼群体的种群增长潜力较低,未来发展将面临严峻挑战.
Abstract
Gymnodiptychus pachycheilus(248 individuals)were collected from the middle reach of Yalong River from October 2020 to May 2022 and used to study reproductive characteristics and assess its population growth potential.The results showed that the number of samples with phase-I and phase-Ⅱ gonads was 66 and 143,respectively.No individual with phase-Ⅵ gonad was observed.The average gonadosomatic index(GSI)of male and female samples were(5.21±0.93)％and(4.75±0.87)％,respectively.The average egg diameter of the 24 female samples was(2.14±0.30)mm,and the spawning type of female G.pachycheilus belongs to the unimodal single spawning type.The average obsolute and relative fecundity of the female samples were(9054±2310)eggs and(6.56±0.69)eggs/g,respectively.A significant positive correlation was observed between absolute fecundity and standard length,body weight(P<0.05).However,no significant correlation was observed between absolute fecundity,and gonad weight(P>0.05).Of the 182 samples that could be sexed,the sex ratio was 1.49:1(♀:♂),and both the female and male samples presented the same minimum sexually mature age(4 years old).Furthermore,considering the constraints imposed by their biological characteristics and the detrimental impacts of habitat changes and human disturbances on population dynamics,the population growth potential of G.pachycheilus inhabiting the middle reaches of the Yalong River is limited,posing significant challenges for its future development.
关键词
裂腹鱼亚科/厚唇裸重唇鱼/繁殖特性/种群增长潜力Key words
Schizothoracinae/Gymnodiptychus pachycheilus/reproductive characteristics/population growth potential引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据