North Pacific Anadromous Fish Commission

Technical Report 15

Table of Contents

Current Status of Chum Salmon Populations in the Rivers with and without Hatchery Stock Enhancement on the Sanriku Coast, Japan

Authors:
Yuki Minegishi, Tatsuya Kawakami, and Jun Aoyama

Abstract Excerpt:
Chum salmon (Oncorhynchus keta) are one of the most important fish species in northern Japan. The hatchery-based stock enhancement program has been implemented since the 1800s and resulted in significant increases of returning adults with the increase of juvenile release. However, the adult return has been decreasing after the peak in 1996 despite the fact that almost constant number of juveniles have been annually released (Hokkaido National Fisheries Research Institute, 2018). In addition, the existence of wild fish and natural spawning was recently reported in many rivers over Japan (Miyakoshi et al. 2012; Morita et al. 2013; Aoyama 2017; Iida et al. 2018), although the chum salmon stock has long been believed to consist of the hatchery-origin fish. Therefore, there is a need to evaluate the status of chum salmon populations of both wild and hatchery-origin fish.

*This is the first paragraph of an extended abstract. Download the full abstract below.

DOI:
https://doi.org/10.23849/npafctr15/23.24.

Citation

Minegishi, Y., T. Kawakami, and J. Aoyama.  2019.  Current status of chum salmon populations in the rivers with and without hatchery stock enhancement on the Sanriku Coast, Japan.  N. Pac. Anadr. Fish Comm. Tech. Rep. 15: 23–24.  https://doi.org/10.23849/npafctr15/23.24.