North Pacific Anadromous Fish Commission

Technical Report 17

Table of Contents

International Variability of Japanese Chum Salmon Abundance in the Summer Bering Sea during a Long Monitoring Survey in 2007–2019

Authors: 
Shunpei Sato and Shigehiko Urawa

Abstract Excerpt:
Asian chum salmon (Oncorhynchus keta), including Japanese stocks, are mainly distributed in the Bering Sea during summer to feed on abundant prey (Urawa et al. 2018). Since 2007, Japanese salmon research cruises have been annually conducted by R/V Hokko maru in the summer Bering Sea in order to monitor the abundance, growth and feeding of chum salmon, and their habitat (e.g., Honda et al. 2021). In this study, we estimated stock-specific abundance of chum salmon using a genetic stock identification (GSI) method. Our monitoring research has been carried out at 17 stations in the central Bering Sea (52º30’N–58º33’N, 174º49’E–174º49’W) using a surface trawl net. The average number of chum salmon caught was 2,885 fish (range: 2,653–3,308 fish) between 2007–2013 except for 2010 (no survey), while it was 2,068 fish (range: 1,532–3,058 fish) between 2014–2019. A total of 21,779 adipose fin samples were collected and DNA was extracted from these samples in the laboratory. Stock compositions (Japan, Russia, and North America) of immature chum salmon were estimated using a conditional likelihood using an SNP baseline dataset from 186 populations in the Pacific Rim (Seeb et al. 2011; Sato et al. 2014).

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

DOI:
https://doi.org/10.23849/npafctr17/16.17.

Citation

Sato, S., and S. Urawa.  2021.  International variability of Japanese chum salmon abundance in the summer Bering Sea during a long monitoring survey in 2007–2019.  N. Pac. Anadr. Fish Comm. Tech. Rep. 17: 16–17.  https://doi.org/10.23849/npafctr17/16.17.