异齿裂腹鱼耳石年轮特征与沉积规律研究  

Characteristic and Deposition Regularity of Otolith Annuli in Schizothorax o’c onnori

作　　者：岳青松 赖柏霖 何智[2,3] 王翔 刘飞[2] 高阔 蒲勇 熊金鑫 罗文杰 黄俊杰 唐子婷 张明旺 杨德英[2,3] 严太明 YUE Qingsong;LAI Bolin;HE Zhi;WANG Xiang;LIU Fei;GAO Kuo;PU Yong;XIONG Jinxin;LUO Wenjie;HUANG Junjie;TANG Ziting;ZHANG Mingwang;YANG Deying;YAN Taiming(Dagu Hydropower Station,Huadian Tibet Hydropower Development Co.,Ltd.,Shannan,Xizang Autonomous Region 856200,China;College of Animal Science and Technology,Sichuan Agricultural University,Chengdu 611130,China;Fish Resources and Environment in Upper Reaches of the Yangtze River Observation and Research Station of Sichuan Province,Chengdu 611130,China)

机构地区：[1]华电西藏能源有限公司大古水电分公司,西藏山南856200 [2]四川农业大学动物科技学院,成都611130 [3]长江上游鱼类资源与环境四川省野外科学观测研究站,成都611130

出　　处：《四川动物》2024年第4期396-405,共10页Sichuan Journal of Zoology

基　　金：华电西藏DG水电站鱼类增殖放流效果研究技术服务项目(12IJD202100068);国家自然科学基金项目(31972777,31402286)。

摘　　要：为提高异齿裂腹鱼Schizothorax o’connori年龄鉴定的准确性,以已知年龄养殖样本为研究对象,确证了其耳石年轮沉积规律,分析了养殖与野生样本微耳石第一年轮形成时间与年轮特征的差异。结果表明:与矢耳石和星耳石相比,微耳石形状变化相对稳定,适宜作为年轮的分析材料;耳石年轮由暗带与相邻亮带组成,亮带与下一个暗带交界处即为年轮,且年轮沉积具年周期性;基于耳石日轮技术推算养殖(n=45)和野生(n=56)样本第一年轮形成时间均在3月下旬至5月上旬;微结构分析发现,养殖与野生样本微耳石的第一年轮中暗带与亮带宽度间的差异极显著(P<0.01)。养殖与野生样本的微耳石半径与体长均呈幂函数关系,微耳石面积与体长均呈线性相关。研究结果为养殖与野生群体识别提供了参考,为异齿裂腹鱼资源保护提供了基础资料。Influenced by changes in external environment and human factors,the population size of Schizothorax o’connori has experienced a significant decline.Otolith microstructure is well recognized as a prevalent phenomenon in teleost fishes and is widely accepted as a powerful tool for studying population dynamics throughout various life stages.In order to improve the accuracy of age identification and explore the annuli characteristics of S.o’connori for resource conservation purposes,the annual increment periodicity of farmed S.o’connori with known age was determined in this study.The timing of the first annulus formation and analysis of otolith annuli characteristics between farmed and wild samples were conducted through otolith microstructure analysis.The results showed that lapilli is a material suitable for studying of annuli characteristics.The cultured fish exhibited an annual deposition pattern in the lapilli,with one opaque zone and translucent zone added per year.Utilizing otolith increment technique,it was calculated that the first annulus formation time for both wild(n=56)and farmed(n=45)specimens occurred from late March to early May.Additionally,the microstructural analysis of otoliths revealed a significant disparity between farmed and wild populations,notably in the width of opaque zone and translucent zone of the 1st annulus(P<0.01).This disparity suggested that these bands could serve as distinct markers for distinguishing the farmed and wild populations.The association between otolith radius and fish standard length was examined,revealing a power function relationship.Furthermore,a linear correlation was observed between otolith radius and fish body length.Considering the current situation of hydropower development,multiplication efforts,and fish release in Yarlung Zangbo River’s main stream,this study contributes to improving the age identification accuracy,providing references for studying fish population dynamics and formulating fisheries management policies.

关 键 词：异齿裂腹鱼 耳石 微结构 年轮特征 第一年轮形成时间 雅鲁藏布江 

分 类 号：S932.4[农业科学—渔业资源] Q959.4[农业科学—水产科学]