Fisheries Science

, Volume 85, Issue 1, pp 43–51 | Cite as

Body condition and reproductive status of chum salmon during homing migration in Otsuchi Bay, Japan, after the 2011 Great East Japan Earthquake and Tsunami

  • Makoto KusakabeEmail author
  • Shigenori Nobata
  • Kaede Saito
  • Kiriko Ikeba
  • Sanae Ogasawara
  • Kiyoshi Tanaka
  • Yoshio Takei
  • Susumu Hyodo
Original Article Biology


To understand how the earthquake and tsunami on March 11 2011 affected homing chum salmon Oncorhynchus keta in Otsuchi Bay, Japan, we monitored the body condition and reproductive status at the mouth of the bay in October, November, December, and January from 2012 to 2016. The average fork length in 2014 was larger than that in 2012 and 2015, due to the high proportion of 5- and 6-year-old salmon and the low proportion of 3- and 4-year-old salmon, possibly because of the decrease in the salmon fry released by the hatchery program after the disaster. Plasma estradiol-17β (E2) concentrations in females were high in October and November and declined in December and January, whereas plasma 11-ketotestosterone concentrations in males were consistently high throughout the sampling period. Plasma 17α,20β-dihydroxy-pregnen-3-one (17α,20β-P) increased in both sexes in December and/or January. These changes were consistently observed from 2012 to 2016; however, the rise in 17α,20β-P and decline in E2 levels in female salmon in December were conspicuous in 2013 and 2014, reflecting changes in age composition. These results suggest that the earthquake and tsunami temporarily affected the age composition and the physiological condition of chum salmon returning to Otsuchi Bay.


Chum salmon Otsuchi bay Steroid hormones Reproduction 



We thank I. Imaseki, A. Iki, N. Inoue, S. Ogawa, T. Shimada, Y. Katayama, N. Miyata, M. Ando, M. Wong and W. Takagi for providing assistance with the sampling. We would also like to thank K. Kakumura for providing assistance with creating figures. We thank J. Aoyama for useful discussions. We would like to take this opportunity to thank all members of the International Coastal Research Center, the Atmosphere and Ocean Research Institute, the University of Tokyo and Shin-Otsuchi Fishery Cooperative for providing invaluable help with sampling. This work was supported by the MEXT Tohoku Ecosystem-Associated Marine Sciences. SN was supported by a JSPS Grant-in-Aid for Scientific Research (15K07544) and Grant-in-Aid for Challenging Exploratory Research (25660153).

Supplementary material

12562_2018_1255_MOESM1_ESM.pptx (342 kb)
Supplementary material 1 (PPTX 342 kb)


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Copyright information

© Japanese Society of Fisheries Science 2018

Authors and Affiliations

  1. 1.Department of Biological Science, Faculty of ScienceShizuoka UniversityShizuokaJapan
  2. 2.Atmosphere and Ocean Research InstituteThe University of TokyoKashiwaJapan

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