软刺裸裂尻鱼耳石日轮及年轮沉积规律研究  

DEPOSITION REGULARITY OF THE DAILY INCREMENTS AND ANNULI IN SCHIZOPYGOPSIS MALACANTHUS

作　　者：严太明[1,2] 蒲勇 陈琪琪 高阔 郑利 焦圆圆 熊金鑫 赖柏霖 唐子婷 何智[1,2] YAN Tai-Ming;PU Yong;CHEN Qi-Qi;GAO Kuo;ZHENG Li;JIAO Yuan-Yuan;XIONG Jin-Xin;LAI Bo-Lin;TANG Zi-Ting;HE Zhi(College of Animal Science and Technology,Sichuan Agricultural University,Chengdu 611130,China;Observation and Research Station of Sichuan Province of Fish Resources and Environment in Upper Reaches of the Yangtze River,College of Animal Science and Technology,Sichuan Agricultural University,Chengdu 611130,China)

机构地区：[1]四川农业大学动物科技学院,成都611130 [2]四川农业大学动物科技学院,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：《水生生物学报》2023年第9期1506-1513,共8页Acta Hydrobiologica Sinica

基　　金：国家自然科学基金(31972777和31402286);生态环境部生物多样性调查评估项目(2019HJ2096001006)资助。

摘　　要：研究利用软刺裸裂尻鱼(Schizopygopsis malacanthus)确证了耳石生长轮沉积规律,并在此基础上,探究了其生长轮与年轮关系,推算了第一年轮形成时间。研究结果表明:仔鱼微耳石第一轮纹在出膜后第二天形成,在实验条件下,轮纹沉积具有日周期性,生长轮为日轮;成鱼轮纹沉积具有年周期性,生长轮每年增加1轮。基于耳石日轮技术推算养殖和野生软刺裸裂尻鱼第一年轮形成时间分别为2021年1月28日至3月13日(n=40)和2017年3月8日至5月10日(n=75)。养殖和野生样本耳石轮纹数年际间的分析结果发现,软刺裸裂尻鱼耳石轮纹数和耳石年生长宽度随着年龄增加逐渐降低,耳石年生长面积随着年龄增加逐渐增加。这些结果揭示了软刺裸裂尻鱼耳石轮纹沉积规律,有助于增加年龄鉴定的准确性,进而为种群动态研究和渔业管理政策制定等提供参考。Schizopygopsis malacanthus is a highly specialized schizothoracine fish.Affected by changes in the external environment and human factors,the population size of S.malacanthus has declined sharply and has been listed as a vulnerable species(VU).Otolith microstructure is now regarded as a widespread phenomenon in teleost fishes and is widely accepted as a powerful tool for studying population dynamics during different stages of the life cycle.Therefore,studies on the characteristics of otolith in S.malacanthus will be helpful for better understanding the characteristics of otolith microstructure deposition,increasing the accuracy of growth characteristics,more fully reflecting the relationship between growth and environmental changes,and providing references for population dynamics research and fishery management policy formulation.In the present study,we analyzed the morphological changes of lapilli and sagittae,confirmed the deposition regularity of otolith daily increment and annuli by lapilli,calculated the formation time of the first annulus of the lapillus,and explored the relationship between its daily increment and annulus.It was found that the morphology of the lapilli was more stable than that of the sagittae,and it was more suitable for the age identification material of S.malacanthus.The breeding experiment confirmed that the first daily increment of lapillus was formed on the second day after hatching under the conditions of this experiment,the increment deposition had a daily periodicity in the larval period,and the growth increments were increments.The lapilli have an annual deposition pattern in the cultured adult fish,with an increase of one ring every year.The width of the increments in the annuli increased first and then decreased.The growth increments in width of cultured fish otoliths were larger than those of wild fish otoliths.Based on the otolith increment technique,it is calculated that the first annulus formation time of farmed and wild is from 28 Jan.to 13 Mar.,2021(n=40)and from 8 Mar.to

关 键 词：耳石 日轮 年轮 养殖群体 野生群体 软刺裸裂尻鱼 

分 类 号：Q174[生物学—水生生物学]