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

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)379-385
Number of pages7
JournalFisheries Science
Volume75
Issue number2
DOIs
Publication statusPublished - 2009 Feb 1
Externally publishedYes

Keywords

  • Age determination
  • Cross-section method
  • Growth
  • Otolith
  • Pseudopleuronectes yokohamae
  • Surface-reading method
  • Tokyo Bay

ASJC Scopus subject areas

  • Aquatic Science

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