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严太明, 张松培, 何亮, 罗杰, 何智. 松潘裸鲤仔稚鱼耳石生长轮日周期确证及其孵化期推算[J]. 水生生物学报, 2019, 43(5): 1034-1040. DOI: 10.7541/2019.122
引用本文: 严太明, 张松培, 何亮, 罗杰, 何智. 松潘裸鲤仔稚鱼耳石生长轮日周期确证及其孵化期推算[J]. 水生生物学报, 2019, 43(5): 1034-1040. DOI: 10.7541/2019.122
YAN Tai-Ming, ZHANG Song-Pei, HE Liang, LUO Jie, HE Zhi. CHARACTERISTICS OF HATCHING TIME AND DAILY INCREMENTS CONFIRMATION OF OTOLITH IN GYMNOCYPRIS POTANINI LARVAE AND JUVENILE[J]. ACTA HYDROBIOLOGICA SINICA, 2019, 43(5): 1034-1040. DOI: 10.7541/2019.122
Citation: YAN Tai-Ming, ZHANG Song-Pei, HE Liang, LUO Jie, HE Zhi. CHARACTERISTICS OF HATCHING TIME AND DAILY INCREMENTS CONFIRMATION OF OTOLITH IN GYMNOCYPRIS POTANINI LARVAE AND JUVENILE[J]. ACTA HYDROBIOLOGICA SINICA, 2019, 43(5): 1034-1040. DOI: 10.7541/2019.122

松潘裸鲤仔稚鱼耳石生长轮日周期确证及其孵化期推算

CHARACTERISTICS OF HATCHING TIME AND DAILY INCREMENTS CONFIRMATION OF OTOLITH IN GYMNOCYPRIS POTANINI LARVAE AND JUVENILE

  • 摘要: 以2015年和2016年在孟屯河上游捕获的仔稚鱼为研究对象, 对其种属进行了鉴定, 观察了耳石形态特征、确证了耳石轮纹沉积规律, 并基于耳石日轮技术对其孵化期进行了推算。结果表明: 基于线粒体细胞色素氧化酶亚单位Ⅰ(Cytochrome oxidase subunit Ⅰ, COⅠ)序列构建的系统进化树显示, 采集仔稚鱼为松潘裸鲤(Gymnocypris potanini)。在松潘裸鲤仔稚鱼生长过程中, 微耳石由近圆形发育成贻贝形, 矢耳石由锲形发育为箭矢状。采用温度标记处理松潘裸鲤仔稚鱼, 确定耳石轮纹沉积具有日周期性, 生长轮为日轮。依据耳石日轮数, 结合采样时间及耳石轮纹沉积规律, 并采用大多数裂腹鱼类日龄为日轮数N+1的关系, 推算出2015年松潘裸鲤样本的孵化时间为6月29日至7月15日, 2016年样本孵化时间为7月13日至8月18日, 这些结果为研究松潘裸鲤野生种群繁殖期及其资源保护等提供了基础数据。

     

    Abstract: Gymnocypris potanini Herzenstein, an endemic freshwater species in China, distributes in the upper reaches of the Minjiang River and the Lancang River and some plateau areas with low water temperature even in the summer. The present study investigated the morphological characteristics, formation period of increment, and hatching date of G. potanini. Larvae were identified by COⅠ sequences, which were caught in the Mengtun River at 2015 and 2016. Homology analysis showed that the COⅠ sequence of captured larvae and juvenile were genetically similar to G. potanini and then identified as the G. potanini. The shape of lapilli finally changed into mussel shape, whereas sagittae became wedge-shaped, the long ellipse shape, and eventually changed into long pointed. Then one increment of lapilli by marked temperature was formed every day. The number of marked increments on lapilli were linearly related to the age, and the slopes of the equations were closed to 1.0 (P>0.05). These results demonstrated a daily formation of otoliths increments. By counting the number of daily increment and confirming daily pattern of the increment deposition, the back-calculated hatching dates of the larvae were from 29 June to 15 July in 2015 and from 13 July to 18 August in 2016, indicating that G. potanini has a long spawning period in late summer. These results provided important information on the spawn time of estimation and the basic data for resources conservation of G. potanini.

     

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