Comparison between surface-reading and cross-section methods using sagittal otolith for age determination of the marbled sole Pseudopleuronectes yokohamae

Jeong Hoon Lee, Keita Kodama, Gen Kume, Masaaki Oyama, Satoshi Katayama, Yuji Takao, Toshihiro Horiguchi

研究成果: Article査読

11 被引用数 (Scopus)

抄録

To find an appropriate method for age determination in the marbled sole Pseudopleuronectes yokohamae in Tokyo Bay, Japan, sagittal otoliths of 1,343 individuals were observed by surface-reading and cross-section methods and the results were compared. Opaque zones occurred once a year and were regarded as annuli in both methods. The surface-reading method sometimes provided a lower count of the number of annuli than the cross-section method, and the frequency of this discrepancy was highest in older fish (males above 5 years, females above 4 years). The oldest female fish was estimated to be age 10 years by the cross-section method but 8 years by the surface-reading method. The cross-section method could provide a more accurate estimate of age and is therefore likely to be indispensable to estimations of longevity. In contrast, the surface-reading method is superior in terms of cost and time efficiency but is likely to underestimate the ages of older fish. However, growth equations based on age estimated by the surface-reading method were sufficiently accurate if males ≥5 years and females ≥4 years were combined as specific, single age groups of 5+ and 4+, respectively.

本文言語English
ページ(範囲)379-385
ページ数7
ジャーナルFisheries Science
75
2
DOI
出版ステータスPublished - 2009 2
外部発表はい

ASJC Scopus subject areas

  • Aquatic Science

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