North Pacific Anadromous Fish Commission

Technical Report 17

Table of Contents

Fine-scale Genetic Population Structure of Chum Salmon on the Iwate Coast, Northern Japan

Authors: 
Shino Kitamura, Tomoaki Goto, Hideharu Tsukagoshi, Yu-ichi Shimizu, Fumihisa Takahashi, and Syuiti Abe

Abstract Excerpt:
Chum salmon (Oncorhynchus keta), with a wide natural range from the Far East to North America and high commercial importance in North Pacific fisheries (Salo 1991), is also an important fishery species in northern Japan. However, the chum salmon catch, or homing number, has been decreasing for nearly two decades on the coast of Iwate Prefecture or the Sanriku-region—the exact reason for such a decrease remains obscure. For effective conservation and management of a species, an accurate description of the genetic population structure is necessary (Spruell et al. 1999) to help provide a clear understanding of what constitutes a population and how population boundaries vary among different watersheds (DeHaan et al. 2014). Two salmon homing peaks are known in Iwate: an early-run from September to the end of October, and late-run from November to February. For conservation and fisheries management of chum salmon in Iwate, the temporal fine-scale genetic population structure was examined using fish collected from the Tsugaruishi River (TGI, predominantly late-run) and Akka River (AKA, predominantly early-run) through the entire homing season.

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

DOI:
https://doi.org/10.23849/npafctr17/184.187.

Citation

Kitamura, S., T. Goto, H. Tsukagoshi, Y. Shimizu, F. Takahashi, and S. Abe.  2021.  Fine-scale genetic population structure of chum salmon on the Iwate Coast, Northern Japan.  N. Pac. Anadr. Fish Comm. Tech. Rep. 17: 184–187.  https://doi.org/10.23849/npafctr17/184.187.