Using otolith weight to predict the age of <Emphasis Type="Italic">Pennahia macrocephalus</Emphasis> in the mouth of the Beibu Gulf |
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| Authors: | Yunrong Yan Yanfang Wu Huosheng Lu Zhonglu Li Xianshi Jin |
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| Institution: | (1) Faculty of Fisheries, Guangdong Ocean University, Zhanjiang, 524088, China;(2) Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China;(3) Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Qingdao, 266071, China;(4) Graduate School of Chinese Academy of Sciences, Beijing, 100039, China |
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| Abstract: | 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 (P≥0.05), 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.
Supported by the National Natural Science Foundation of China (No. 30771653) and Bureau of Fisheries, Ministry of Agriculture |
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| Keywords: | Keyword" target="_blank">Keyword Pennahia macrocephalus sagittal otolith weight-age relationship the mouth of the Beibu Gulf |
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