| 怒江上游热裸裂尻鱼年龄结构与生长特性 |
| Age Structure and Growth Characteristics of Schizopygopsis thermalis in the Upper Nujiang River |
| 投稿时间：2021-03-02 修订日期：2022-07-16 |
| DOI：10.15928/j.1674-3075.202103020054 |
| 中文关键词:热裸裂尻鱼 耳石 年龄结构 生长特征 |
| 英文关键词:Schizopygopsis thermalis otolith age structure growth characteristic the Nujiang River |
| 基金项目:农业农村部财政专项“西藏水域渔业资源与环境调查”；中国水产科学研究院创新团队项目（2020TD09） |
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| 中文摘要: |
| 热裸裂尻鱼（Schizopygopsis thermalis）是怒江上游鱼类的优势种之一，为了更好地管理和保护裂腹鱼类，分析其年龄结构和生长特征对种群资源现状及保护有重要意义。2019年3-5月和9-11月，在西藏自治区怒江干流八宿至那曲江段设置7个采样点，共计采集热裸裂尻鱼245尾，以微耳石为年龄鉴定材料，初步探讨怒江上游热裸裂尻鱼年龄结构与生长特征。结果显示，所采集热裸裂尻鱼体长为3.1~35.5 cm，体重为1.28~504.42 g。体长(L)与微耳石半径(r)长轴呈正相关，其表达式为：L=22.537r-5.469(R2=0.9518,n=229)。体长(L)-体重(W)表达式为：W=2×10-5L2.8833(R2=0.9915，n=229)，生长系数k值为0.099，生长指标φ为4.22。样本中共发现16个年龄组（2~17）。各采样点间年龄结构存在差异，高海拔地区热裸裂尻鱼种群年龄范围和个体平均年龄均大于低海拔地区。建议加强怒江八宿至洛隆河段的鱼类资源保护。 |
| 英文摘要: |
| Schizothoracinae is one of three important fish taxa on the Qinghai-Tibet Plateau. Schizopygopsis thermalis is a dominant species in the upper reaches of the Nujiang River with important ecological value. In this study, we explored the age structure and growth characteristics of S. thermalis in Nujiang River, aiming to provide scientific evidence for the management and protection of S. thermalis. From March to November 2019, S. thermalis specimens were collected at 7 sampling sites from the section between Basu and Naqu on the main stem of Nujiang River. A total of 245 specimens were collected during the survey. The body length and weight of each specimen were measured and the otolith was selected as the material for age identification. Results show that the body length and body weight of S. thermalis specimens were in the range of 3.1-35.5 cm and 1.28-504.42 g, with average values of (15.67±8.59) cm and (90.92±128.60) g. The relationship of body length (L) to body weight (W) was described as W=2×10-5L2.8833 (R2=0.9912), indicating allometric growth, and the growth coefficient (k) and growth index (φ) for S. thermalis were, respectively, 0.099 and 4.22. The body length (L) and otolith long axis radius (r) were positively correlated, described as, L=22.537r-5.469 (R2=0.9518, n=229). The S. thermalis specimens consisted of 16 age groups (2 - 17a), with dominance by the 4-year-old group (17.5%). Furthermore, age structure at different sampling sites varied, with high altitude populations having a broader age range and more older individuals. The growth inflection point age was 11.62 a, with a corresponding weight of 260.4 g and body length of 26.74 cm. We recommend strengthening natural resource protection in the river section from Basu to Luolong. |
| 陈一竹,朱峰跃,刘明典,段辛斌,刘绍平,陈大庆,汪登强.2022.怒江上游热裸裂尻鱼年龄结构与生长特性[J].水生态学杂志,43(4):111-118. |
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