作 者：
兰丹;郝辉擘;蒋日进;杨凡;李霞芳;赵芃;刘明智;印瑞
关键词：
鮸;舟山渔场;胃含物;稳定同位素;摄食习性
摘 要：
为了研究鮸(Miichthys miiuy)在舟山渔场生态系统食物网结构中的地位和作用,本研究于2021年8月至2023年6月在舟山渔场逐月采集鮸样品共计727尾,结合胃含物分析法和碳、氮稳定同位素技术,分析鮸的摄食习性.结果表明,舟山渔场鮸的主要饵料生物类群有鱼类(Pisces)、虾类(Decapoda)、口足类(Stomatopoda)、头足类(Cephalopoda)、双壳类(Lamellibranchia)、蟹类(Brachyura),优势饵料种为龙头鱼(Harpodon nehereus)、棘头梅童鱼(Collichthys lucidus)、凤鲚(Coilia mystus)、黄鲫(Setipinna taty)和六丝钝尾虾虎鱼(Amblychaeturichthys hexanema).其δ13C值范围为-19.09‰~-13.04‰,平均值为(-16.74±1.03)‰,与体长呈显著负相关(P<0.01);δ15N值范围为10.72‰~15.96‰,平均值为(12.44±1.36)‰,与体长呈显著正相关(P<0.01).根据δ15N值计算出舟山渔场鮸的营养级范围为3.93~4.92,平均营养级为4.30±0.39,营养级与其体长呈显著正相关(P<0.01).稳定同位素分析结果显示,口足类对鮸的营养贡献率最高(20.6%),其次是头足类(18.3%)、虾类(16.4%),双壳类的食源贡献率最低,为13.7%.鮸全年均摄食,摄食强度随季节、体长变化显著,从不同季节来看,冬季的胃饱满指数最高,秋季最低;从不同体长来看,大个体胃饱满指数低,小个体胃饱满指数高.空胃率则为秋季最高,冬季最低;空胃率随体长变化不明显.本研究有助于深入了解舟山渔场鮸的摄食习性,为研究食物网动态变化和营养动力学提供基础资料和科学依据.
译 名：
Feeding habits of Miichthys miiuy in Zhoushan fishing ground
关键词：
Miichthys miiuy%Zhoushan fishing ground%stomach content%stable isotope%feeding habit
摘 要：
To study the position and role of Miichthys miiuy in the food web of Zhoushan fishing ground ecosystem,we collected a total of 727 Miichthys miiuy samples monthly from August 2021 to June 2023 on Zhoushan fishing ground,and examined the feeding habits based on both stomach content analysis method and carbon and nitrogen stable isotope techniques.The results indicated that the main prey species of Miichthys miiuy in Zhoushan fishing ground were Pisces,Decapoda,Stomatopoda,Lamellibranchia,Cephalopoda,and Brachyura.Harpodon nehereus,Collichthys lucidus,Coilia mystus,and Amblychaeturichthys hexanema were the dominant prey species.The δ13C of Miichthys miiuy ranged from-19.09%to-13.04‰,with an average value of-(16.74±1.03)‰,which was negatively correlated with body length(P<0.01).The value of δ15N was between 10.72%and 15.96‰,with an average value of(12.44±1.36)‰,which was significantly positively correlated with body length(P<0.01).The trophic level of Miichthys miiuy on the Zhoushan fishing ground,calculated from δ15N values,ranged from 3.93 to 4.92,with an average trophic level of 4.30±0.39,and the trophic level was significantly positively correlated with body length(P<0.01).The stable isotope analysis revealed that Stomatopoda made the highest contribution to Miichthys miiuy trophic level(20.6%),followed by Cephalopoda(18.3%),Decapoda(16.4%),and Lamellibranchia(13.7%).Miichthys miiuy fed throughout the year,and feeding intensity varied significantly with season and body length.Seasonally,the stomach fullness index was the highest in winter and the lowest in autumn;in terms of body length,the stomach fullness index was low for large individuals and high for small individuals.The empty stomach rate was the highest in autumn and the lowest in winter.The empty stomach rate did not significantly vary with body length.These results will help to understand the feeding habits of Miichthys miiuy on Zhoushan fishing ground and provide basic information and scientific basis for the study of food web dynamics and trophic dynamics.
