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Fisheries Science

, Volume 84, Issue 3, pp 425–433 | Cite as

Long-term shifts in the growth and maturation size of Miyabe charr Salvelinus malma miyabei

  • Yuki Yamamoto
  • Taku Yoshiyama
  • Keitaro Kajiwara
  • Toshikuni Nakatani
  • Takashi Matsuishi
Original Article Fisheries

Abstract

Overfishing can affect life history traits, resulting in population collapse and oftentimes a decrease in length-at-age and maturation size in fish populations. However, little is known about the recovery mechanisms and time scales of these traits in exploited wild populations. In the study reported here, we documented long-term shifts in growth and mature size in Miyabe charr Salvelinus malma miyabei associated with a history of recreational fishing in Lake Shikaribetsu for approximately 80 years. Downsizing in the charr was observed when the charr population collapsed due to intensive recreational fishing. However, subsequent moratoriums and the introduction of fishing regulations, especially the implementation of a catch-and-release policy, during the following 10–30 years facilitated the recovery of population size, length-at-age and mature fish size. This study provides important insights into the biological changes and required recovery time scales of a heavily harvested population and supports management and conservation strategies.

Keywords

Life-history trait shifts Miyabe charr Overfishing Recreational fishing pressure Recreational fishing regulations 

Notes

Acknowledgements

This study was supported by the management staff of Great Fishing in Lake Shikaribetsu; we thank Takeda K, Tabata T, Sawada K, Takahashi K and Otagiri H for sampling assistance. The authors also acknowledge Itou M and all the staff of the Commerce and Tourism Department of the Shikaoi Town government for their administrative support. The authors are grateful to Takatsu T for help with age determination and to Shimizu M and Tojo N for constructive comments on the manuscript. This research did not receive any specific grants from funding agencies in the public, commercial, or not-for-profit sectors.

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Copyright information

© Japanese Society of Fisheries Science 2018
corrected publication April 2018

Authors and Affiliations

  1. 1.Faculty of Fisheries SciencesHokkaido UniversityHakodateJapan
  2. 2.Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
  3. 3.Global Institution for Collaborative Research and Education, Faculty of Fisheries SciencesHokkaido UniversityHakodateJapan

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