三门湾和吕四近岸小黄鱼仔稚鱼耳石微结构特征比较  

Comparision of otolith microstructures in small yellow croaker larvae and juveniles from Sanmen Bay and Lvsi

作　　者：黎雨轩[1] 汤建华[3] 徐献明[3] 许津[3] 刘志远[1,2] 徐浩[1,2] 程家骅[1] 

机构地区：[1]中国水产科学研究院东海水产研究所,农业部东海与远洋渔业资源开发利用重点实验室,上海200090 [2]上海海洋大学海洋科学学院,上海201306 [3]江苏省海洋水产研究所,南通226007

出　　处：《海洋渔业》2013年第4期423-431,共9页Marine Fisheries

基　　金：中央级公益性科研院所基本科研业务费专项资助项目(2011M11);国家自然科学基金青年基金(31101901)等资助

摘　　要：对三门湾和吕四近岸小黄鱼（Larimichthys polyactis）仔稚鱼的矢耳石微结构特征进行了比较研究.结果表明：小黄鱼矢耳石上的轮纹是每日形成的,第一日轮在孵化后第2天形成,由仔鱼期向稚鱼期过渡时形成的次生核;三门湾和吕四近岸海域在个体的生长、发育和次生核之间均表现出明显的一致性：生长较快的个体,第一次生核形成的时间也较早,次生核数量亦多;两个海域小黄鱼的耳石微结构存在明显的差异,吕四近岸的个体在仔鱼期耳石生长率更快（均值为0.039）,第一次生核形成时间较短（均值为37日龄）,次生核数量较多（7～8个）,表明吕四近岸个体具有较快的生长率和发育速度,这种差异可能是因为吕四近岸的个体在仔鱼期所经历的水温较高.以上研究结果表明,矢耳石的微结构特征可以反映野生小黄鱼的早期生长发育状况,不同海区小黄鱼仔稚鱼的矢耳石微结构特征存在显著差异,可以用于区分小黄鱼不同海域栖息的个体,将为小黄鱼早期资源补充过程和早期选择性死亡等研究提供理论基础.Otolith microstructure of small yellow croaker Larimichthys polyactis larvae and juveniles were analyzed,including 61 known-age individuals that were fertilized artificially and 308 individuals sampled from Samen Bay（28.9°N,121.9°E） and Lvsi（32.1°N,121.7°E） in April and May 2011.Results showed as follows：（1） The daily periodicity of growth increment formation in sagittal otoliths was validated.The first daily increment was formed on the second day after hatch,corresponding to the initial feeding.The first secondary primordium was formed during the metamorphism from larvae to juveniles; （2） The relationship between body length （Ls） and otolith radius （R） was significantly described by the linear function：Ls =-122.24＋38.12R （n=90,R2=0.92,P〈0.001; Ls=-115.43＋31.84R （n=162,R2=0.94,P〈0.001）,indicating that somatic growth history can be reconstructed from otolith growth patterns ; （3） The time of the formation of the first secondary primordium （Tspl） was significantly linearly related to growth rate during larvae stage（b） that based on daily increment width in sagitta of juveniles from Sanmen Bay and Lvsi：Tspl =57.4-520.5b （n =90,R2 =0.5136,P 〈0.001） ; （4） The individuals with higher growth rate during larvae stage had more secondary primordia; （5） Significant differences were examined in otolith microstructure of juveniles from Sanmen Bay and Lvsi.The juveniles from Lvsi had higher growth rate during larvae stage and more secondary primordia,indicating rapid somatic growth in Lvsi.The time that secondary primordium formed in juveniles from Lvsi was earlier,indicating shorter larvae stage and probably higher survival rates.The higher sea-surface temperature that small yellow croaker from Lvsi underwent during the lavae stage in 2011 might partially explain the difference in otolith microstructure.To sum up,the growth and development in early life history of Larimichthys polyactis could be backcalculated from otolith microstructure.The diffenece i

关 键 词：小黄鱼 耳石 日轮 次生核 生长率 

分 类 号：Q959.483[生物学—动物学]