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象山港黄姑鱼增殖群体早期生态适应特征
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作者:张辉  姜亚洲  袁兴伟  林楠  凌建忠 
单位:中国水产科学研究院东海水产研究所, 农业农村部东海渔业资源开发利用重点实验室, 上海 200090
关键词:象山港 黄姑鱼 增殖放流 生长速率 摄食 
分类号:S931
出版年·卷·期(页码):2020·27·1(118-124)
摘要:
通过分析增殖放流3个月内象山港黄姑鱼(Nibea albiflora)增殖群体的摄食能力和生长速率,阐述了黄姑鱼放流初期对自然水体的生态适应特征。研究结果表明,放流结束1个月,黄姑鱼增殖群体的摄食能力较弱,空胃率高达80.95%,饵料生物生态位宽度指数仅为自然群体的63.0%;肝脏指数较放流前明显降低,说明肝脏储能大幅消耗;特定生长速率仅为0.079%/d,个体生长基本处于停滞状态。随时间推移,增殖群体对自然水体的适应能力逐渐增强,至放流结束2个月,其空胃率下降到了46.15%,饵料生物生态位宽度指数上升到了2.16,与自然群体的空胃率(38.24%)和饵料生物生态位宽度指数(2.62)相比差距已经大幅度缩小,摄食能力明显提升,肝脏指数基本恢复至放流前水平;生长速率较前一时期明显加快,呈现出一定的补偿性生长特征。
The ecological fitness of hatched and released Nibea albiflora juveniles, during their early post-release period in Xiangshan Bay, was investigated through analyzing their post-release growth performance and feeding over a 3-month period. During the early days following the release, the fish exhibited poor feeding and growth performances. After the first month following the release, approximately 80.95% of the individuals were detected to have empty stomachs. In addition, the dietary niche breadth index was only 63% of that of their wild conspecifics. The hepatopancreas somatic index reduced compared to that prior to release, indicating that the utilization of the energy stored in the liver should be an important route for the juveniles to cope with starvation induced by a low-feeding success. During this period, the growth in length tended to stagnate, with a specific growth rate of only 0.079%/d. Approximately 2 months after release, the empty stomach percentage decreased to 46.15% and the index of dietary niche breadth increased to 2.16 for the released fish. Meanwhile for wild fish, the empty stomach percentage was 38.24% and the index of dietary niche breadth was 2.62. The gaps of the empty stomach percentage and the index of dietary niche breadth between wild fish and released fish were greatly shrinking. Thus, it strongly suggested that the released fish were successfully adapting to the natural feeding conditions. As the feeding ability improved, the hepatopancreas somatic index of the juveniles gradually returned to the level prior to release. Meanwhile, the specific growth rate of the released fish increased sharply. The released fish underwent a period of compensatory growth, a phase of rapid growth following starvation, which gradually returned to the normal growth pattern.
该文献标准引用格式:
ZHANG Hui, JIANG Yazhou, YUAN Xingwei, LIN Nan, LING Jianzhong.Ecological adaptability of hatched and released Nibea albiflora during the early post-release period in Xiangshan Bay, East China Sea[J].Journal of Fishery Sciences of China,2020,27(1):118-124.[张辉, 姜亚洲, 袁兴伟, 林楠, 凌建忠.象山港黄姑鱼增殖群体早期生态适应特征[J].中国水产科学,2020,27(1):118-124.]
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