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Using otolith weight to predict the age of Pennahia macrocephalus in the mouth of the Beibu Gulf

文献类型： 外文期刊

作者： Yan Yunrong 1 ; Wu Yanfang 1 ; Lu Huosheng 1 ; Li Zhonglu 1 ; Jin Xianshi 3 ;

作者机构： 1.Guangdong Ocean Univ, Fac Fisheries, Zhanjiang 524088, Peoples R China

2.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China

3.Chinese Acad Fisheries Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China

4.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

关键词： Pennahia macrocephalus;sagittal otolith;weight-age relationship;the mouth of the Beibu Gulf

期刊名称：CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY （ 影响因子：1.068； 五年影响因子：0.983 ）

ISSN： 0254-4059

年卷期： 2009 年 27 卷 2 期

页码：

收录情况： SCI

摘要： The relation between otolith weight (OW) and the age of marine fish is studied. A total of 222 individuals of bighead white croaker, Pennahia macrocephalus were sampled seasonally in the mouth of the Beibu Gulf, the South China Sea, in 2007. Since there are no significant differences in sagittal OW between otolith in pairs (Pa parts per thousand yen0.05), the undamaged left sagittal otolith is used for age determination. The highest correlations among standard length, OW and fish ages are confirmed by linear, exponential and multinomial regression. Results show that sagittal OW overlaps only occasionally among age groups, and to individuals with similar standard length, the older and slower-growing fish has a heavier otolith because of the continued otolith material deposition. There are differences in sagittal OW among different age groups and significant positive linear relationship with age (P < 0.05). The age readings can be verified by plotting the sagittal OW versus the standard length for age groups, and the individuals with similar standard length but in different ages can be separated by sagittal OW frequency analysis. Mostly, the predicted ages using the regression between sagittal OW and ages are closed to the observed ages by counting annulus on scale. It indicates that the sagittal OW analysis is a useful technique for validating the accuracy of age determination by annuli counts, especially for individuals of similar size. Furthermore, the technique is applied for Pennahia macrocephalus with discussion in this paper.

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