

FOLLOWUS
1. Faculty of Fisheries Guangdong Ocean University
2. Institute of Oceanology Chinese Academy of Sciences
3. Graduate School of Chinese Academy of Sciences
4. Yellow Sea Fisheries Research Institute Chinese Academy of Fisheries Sciences
Online First:12 July 2009,
Published:2009
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Yan, Y., Wu, Y., Lu, H. et al. Using otolith weight to predict the age of Pennahia macrocephalus in the mouth of the Beibu Gulf., Chin. J. Ocean. Limnol. 27, 342–349 (2009). https://doi.org/10.1007/s00343-009-9210-3
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.
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