雅鲁藏布江墨脱段的墨头鱼属待定名种种群的年龄结构和生长特性

Age Structure and Growth Characteristics of Garra sp. Population in Motuo Section of Yarlung Zangbo River

为了了解西藏雅鲁藏布江墨头鱼属(Garra)的待定名种(Garra sp.)的生长特性和种群动态,2017年3~4月和2018年4月、10月,在西藏雅鲁藏布江墨脱段设置了采样点,采集了墨头鱼属待定名种的样本,以其微耳石作为年龄鉴定材料,分析了墨头鱼属待定名种样本的体长、体质量、年龄组成和体长与体质量的关系,利用von Bertalanffy方程,描述了墨头鱼属待定名种的生长特性,探讨了墨头鱼属待定名种资源保护的途径。研究结果表明,在各采样点采集的墨头鱼属待定名种样本的年龄为4~8龄,其中,7龄个体的数量占总个体数量的57.2%;墨头鱼属待定名种样本的体长为90.0~178.0 mm,其(平均值±标准误)为(151.2±17.8) mm;样本的体质量为11.2~118.4 g,其(平均值±标准误)为(65.6±21.5) g;样本中的雌性与雄性个体的生长指标无显著差异;西藏雅鲁藏布江墨脱段的墨头鱼属待定名种种群的拐点年龄为5.72龄,所对应的墨头鱼属待定名种的体长为134.5 mm,体质量为58.0 g。

To understand the growth characteristics and population dynamics of Garra sp. from Motuo section of Yarlung Zangbo River in the Tibet Autonomous Region and to provide a scientific basis for the conservation of this species, sample collection was conducted from March to April 2017 and April to October2018. Using micro-otoliths as age identification ion materials, the body length, weight, age composition, and the relationship between body length and weight of the population were analyzed. The von Bertalanffy equation described the growth characteristics of Garra sp., and resource protection methods were also discussed. The results showed that the age range of the samples was 4-8 years old, and most individuals were7 years old, accounting for about 57.2% of the total samples. The sample body length range was 90.0-178.0mm, and the of(average±standard error) of body length was(151.2±17.8) mm. The body weight distribution ranged from 11.2-118.4 g, and its(average ± standard error) was(65.6 ± 21.5) g. The growth of relationships showed no significant difference between females and males. This study showed that the age at the inflection point of body weight growth was 5.72 years, in which total length and body weight was 134.5 mm and 58.0 g,respectively, which provided a scientific basis for the conservation of this species.