水产学报2013，Vol.37Issue(4)：496-501,6.DOI:10.3724/SP.J.1231.2013.38361
长江口凤鲚幼鱼的耳石微结构、日龄与生长
Sagittal otolith microstructure,daily age and early growth of Coilia mystus juveniles in the Yangtze Estuary
摘要
Abstract
Coilia mystus is a commercially important fish in the Yangtze Estuary. Annual capture averaged 2 000 tonnes in the 1980s,accounting for almost half of the total catch in this estuarine area. However,this species has declined dramatically since the late 1990s. C. mystus juveniles were sampled from the Yangtze Estuary using trawls and set nets in July, August and September 2007. Sagittal otoliths were analyzed to estimate the daily age and early growth of the juveniles. Standard length ( Ls) of C. mystus juveniles was between 25.6 and 63. 2 mm. Otolith shape of C. mystus juveniles was similar to that of adults: anomalistic and elliptic,with a single rostral protrusion. There was one nucleus and one primordium on the transverse plane of the otolith. Primordium diameters were between 12. 5 and 22. 8 μm, averaging (14. 3 ±4.8) μm ( n = 111). The distance from the central nucleus to the first increment was ( 24. 85 ± 6. 38 ) μm (n =44). The increments in the long axis were thin and unclear, but those in the short axis were thick and clear. Estimated ages of collected specimens ranged from 54 to 128 days. Hatch dates fell between 10 April and 23 July 2007, with the peak between 11 may and 26 June. The relationship of otolith radius (R) to standard length(Ls) was fitted to a linear function;Ls = 6. 68 + 0. 065R ( r2 = 0. 81, n = 111, P < 0. 05 ). The incremental width was narrow and decreasing in the first 20 increments;after that, the incremental width increased to the 50th increment, and then remained constant.关键词
凤鲚/矢耳石/微结构/日龄/生长/长江口Key words
Coilia mystus juvenile/sagittal otolith/daily age/growth/the Yangtze Estuary分类
生物科学引用本文复制引用
何文平,黎雨轩,李钟杰,谢松光..长江口凤鲚幼鱼的耳石微结构、日龄与生长[J].水产学报,2013,37(4):496-501,6.基金项目
国家重点基础研究发展计划(2010CB429000) （2010CB429000）
国家自然科学基金项目(30770354) （30770354）
淡水生态与生物技术国家重点实验室开放课题(2009FB15) （2009FB15）
中国科学院"百人计划"择优支持项目. （）
