| 引用本文: | 刘熠,任鹏,杨习文,李新丰,徐东坡,方弟安.长江下游刀鲚(Coilia nasus)仔稚鱼的时空分布.湖泊科学,2020,32(2):506-517. DOI:10.18307/2020.0219 |
| LIU Yi,REN Peng,YANG Xiwen,LI Xingfeng,XU Dongpo,FANG Di'an.Spatial and temporal distribution of larvae and juvenile Coilia nasus in the lower reaches of the Yangtze River. J. Lake Sci.2020,32(2):506-517. DOI:10.18307/2020.0219 |
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| 长江下游刀鲚(Coilia nasus)仔稚鱼的时空分布 |
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刘熠1,2, 任鹏1, 杨习文1,2, 李新丰1,2, 徐东坡1,2, 方弟安1,2
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1.中国水产科学研究院淡水渔业研究中心, 农业部长江下游渔业资源环境科学观测实验站, 无锡 214081;2.上海海洋大学水产科学国家级实验教学示范中心, 上海 201306
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| 摘要: |
| 刀鲚（Coilia nasus）是长江下游重要的经济鱼类之一，具有溯河洄游型和淡水定居型两种生态类型.本研究于2016年5-8月在刀鲚繁殖高峰期内同时对长江下游湖口、安庆和靖江江段进行刀鲚早期资源调查，研究分析对比了长江下游江段刀鲚仔稚鱼的丰度情况、时空格局及其与主要环境因子的关系.结果表明：在调查期间，靖江江段刀鲚仔稚鱼平均密度最高；刀鲚仔稚鱼在调查各江段于6月下旬至7月上旬之间均出现一段较短时间的高峰期，这与刀鲚的产卵类型有关；湖口刀鲚仔稚鱼的爆发时间早于安庆和靖江江段，这种现象可能是由于湖口江段存在的定居型刀鲚产卵造成的；推测长江江水倒灌的特殊环境现象刺激了刀鲚性腺的发育，使得湖口江段8月产卵群体较多；各江段断面空间上的刀鲚仔稚鱼密度差异可能是沿岸地形和水体动力学差异所产生的现象；各江段刀鲚仔稚鱼密度最高峰时的水流量均处于较低水平，水温分别为25.87、25.27和21.67℃，均达到了刀鲚产卵所需条件.研究结果初步反映了长江下游刀鲚仔稚鱼的时空特征，为长江下游刀鲚资源的保护提供了参考依据. |
| 关键词: 长江下游 刀鲚 仔稚鱼 时空分布 |
| DOI：10.18307/2020.0219 |
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| 基金项目:中央级公益性科研院所基本科研业务费专项（2017JBFR04）和农业农村部财政专项联合资助. |
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| Spatial and temporal distribution of larvae and juvenile Coilia nasus in the lower reaches of the Yangtze River |
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LIU Yi1,2, REN Peng1, YANG Xiwen1,2, LI Xingfeng1,2, XU Dongpo1,2, FANG Di'an1,2
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1.Scientific Observing and Experimental Station of Fishery Resources and Environment in the Lower Reaches of the Changjiang River, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, P. R. China;2.National Demonstration Center for Experimental Fisheries Science Education(Shanghai Ocean University), Shanghai Ocean University, Shanghai 201306, P. R. China
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| Abstract: |
| Coilia nasus is one of the most important economic fishery species in the lower reach of the Yangtze River. It has two ecological types, one is anadromous and the other is freshwater resident. This study investigated the early resource of Coilia nasus in the lower reaches of the Yangtze River in Hukou, Anqing and Jingjiang during the peak breeding season from May to August 2016. The abundance, temporal and spatial distribution patterns of larval and juvenile C. nasus in the lower reaches of the Yangtze River and their variation and relationship with major environmental factors were analyzed. Results showed that the mean density of larvae and juveniles C. nasus in the Jingjiang section was highest during the investigation period. There was a short peak period between late June and early July in the surveyed river section, which may be related to the C. nasus spawning type. The occurrence of larval and juvenile C. nasus in Hukou section was earlier than in Anqing and Jingjiang section, which may result from resident C. nasus spawning in Hukou section. It is inferred that the special environment phenomenon of the back-flow of the Yangtze River stimulates the C. nasus gonad development, which resulted in more spawning populations in the Hukou section in August. The density difference of larval and juvenile C. nasus in the three sampling sites may be due to the difference between coastal topography and water dynamics. The water flow of larval and juvenile C. nasus at the highest density was lower in all river segments, and the water temperature was 25.87, 25.27 and 21.67℃, respectively. The hydrodynamic environment of the three sites meet the requirement for C. nasus spawning. Results in this study preliminarily reflect the spatial-temporal characteristics of larval and juvenile C. nasus in the lower reaches of the Yangtze River and provide information for C. nasus resource conservation. |
| Key words: The lower reaches of the Yangtze River Coilia nasus larval and juvenile spatial and temporal distribution |
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