Fisheries Science

, Volume 73, Issue 3, pp 585–592 | Cite as

Age validation and growth variability of Japanese flounder Paralichthys olivaceus off the Pacific coast of northern Japan

  • Michio YonedaEmail author
  • Yutaka Kurita
  • Daiji Kitagawa
  • Masaki Ito
  • Takeshi Tomiyama
  • Tomoaki Goto
  • Kiyotaka Takahashi


This study examined age and growth of Japanese flounder Paralichthys olivaceus off the Pacific coast of northern Japan, and determined whether the growth patterns of male and female fish in northern (40–41°N) and southern (37–38°15′N) waters differ. In total 8095 specimens were collected between January 1999 and December 2005. Zonation consisting of opaque and translucent bands on the otolith was evident. Within each opaque band a thin and clear check (ring mark) was observed in all specimens examined. Monthly change in the frequency of appearance of a ring mark on the outer margin of the otolith indicates that ring marks form between July and August. The von Bertalanffy growth model showed a sexual dimorphism in growth, as females grew faster and reached a larger size than males. The growth patterns obtained by tracking the observed total length for monthly collections showed a rapid increase in total length between August and October. Spatial variation in the growth pattern of male and female fish between northern and southern waters was evident, as southern fish were significantly larger than northern counterparts during 1.25–3.00 years post hatch.

Key Words

flounder geographic variation growth otolith Pacific coast Paralichthys olivaceus 


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Copyright information

© The Japanese Society of Fisheries Science 2007

Authors and Affiliations

  • Michio Yoneda
    • 1
    Email author
  • Yutaka Kurita
    • 1
  • Daiji Kitagawa
    • 2
  • Masaki Ito
    • 3
  • Takeshi Tomiyama
    • 4
  • Tomoaki Goto
    • 5
  • Kiyotaka Takahashi
    • 6
  1. 1.Tohoku National Fisheries Research InstituteShiogama, MiyagiJapan
  2. 2.Hokkaido National Fisheries Research InstituteKushiro, HokkaidoJapan
  3. 3.Hachinohe BranchTohoku National Fisheries Research InstituteHachinohe, AomoriJapan
  4. 4.Fukushima Prefectural Fisheries Experimental StationIwaki, FukushimaJapan
  5. 5.Iwate Fisheries Technology CenterKamaishi, IwateJapan
  6. 6.Miyagi Prefecture Fisheries Research and Development CenterIshiomaki, MiyagiJapan

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