Estimates on age, growth, and mortality of Leuciscus chuanchicus (Kessler 1876) in the Ningxia section of the upper reaches of the Yellow River, China

文献类型： 外文期刊

第一作者： Xiong, Shuhan

作者： Xiong, Shuhan;Liu, Jiacheng;Li, Peilun;Wang, Jilong;Xiong, Shuhan;Liu, Jiacheng;Li, Peilun;Wang, Jilong;Xiong, Shuhan;Liu, Jiacheng;Li, Peilun;Wang, Jilong;Liu, Yanbin;Liu, Kai;Wang, Yongjie

作者机构：

关键词： Leuciscus chuanchicus; Growth characteristics; Mortality estimates; Exploitation rate

期刊名称：PEERJ （ 影响因子：2.3； 五年影响因子：2.8 ）

ISSN： 2167-8359

年卷期： 2024 年 12 卷

页码：

收录情况： SCI

摘要： To investigate the age structure, growth pattern, mortality and exploitation rates of Leuciscus chuanchicus in the upstream Ningxia section of the Yellow River, four sampling surveys were conducted between 2022 and 2023. A total of 472 individuals were measured for their total length ( TL ) and body weight ( W ). Age determination was performed using otoliths. The collected samples had a range of total lengths from 4.52 to 37.45 cm, body weights ranging from 0.68 to 552.43 g, and ages ranging from 1 to 7 years old. The relationship between total length and body weight was expressed as W = 0.0052 L 3.19 for all samples, which indicates that the growth of L. chuanchicus adheres to allometry. The Von Bertalanffy growth equation revealed that the fi sh had an asymptotic total length ( L infinity ) of approximately 37.9 cm with a growth coef fi cient ( K ) value of approximately 0.461 yr - 1 . Using the age -based catch curve method, the calculated total instantaneous mortality rate ( Z ) for all samples was determined as being equal to approximately 1.1302 yr - 1 . Additionally, three methods were used to estimate the average instantaneous rate of natural mortality ( M ), resulting in an approximate value of 0.7167 yr - 1 for all samples. Furthermore, the instantaneous rate of fi shing mortality ( F ) for all samples was calculated as 0.4134 yr - 1 , leading us to determine that the exploitation rate ( E ) is 0.3658. It was concluded that the growth rate of L. chuanchicus in the upstream of the Yellow River is relatively fast, and L. chuanchicus has not been subjected to excessive exploitation, yet its relatively high natural mortality rate underscores the need for targeted management measures aimed at preserving its habitat.

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