North Pacific Anadromous Fish Commission

Technical Report 15

Table of Contents

Migration and Homing Behavior of Chum Salmon Tagged in the Okhotsk Sea, Eastern Hokkaido

Authors:
Hayato Saneyoshi, Yousuke Koshino, Ryoutarou Ishida, Itsuki Tatsuoka, Hokuto Shirakawa, Yasuyuki Miyakoshi, and Kazushi Miyashita

Abstract Excerpt:
Chum salmon (Oncorhynchus keta) are one of the most important species for commercial fisheries in Hokkaido in northern Japan. The Okhotsk coast in eastern Hokkaido is the principal area of salmon production in Japan. Commercial catches of chum salmon have been supported by intensive hatchery programs (Miyakoshi et al. 2013). In Hokkaido, returning chum salmon are fished in coastal waters mainly via set nets that are operated from September to December. Recently, coastal sea water temperatures in autumn have been higher than the historic mean. In years with high coastal sea water temperatures (> 20°C), it has been frequently observed that the peak timing of chum salmon landing was delayed and exploitation rates by coastal set net fisheries were low. In addition, high water temperatures might affect the distribution of chum salmon in coastal areas and the number of fish caught by each set net. In order to determine the effects of sea water temperature on commercial landings, the responses of migrating chum salmon to sea water temperature needs to be elucidated.

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

DOI:
https://doi.org/10.23849/npafctr15/63.64.

Citation

Saneyoshi, H., Y. Koshino, R. Ishida, I. Tatsuoka, H. Shirakawa, Y. Miyakoshi, and K. Miyashita.  2019.  Migration and homing behavior of chum salmon tagged in the Okhotsk Sea, eastern Hokkaido.  N. Pac. Anadr. Fish Comm. Tech. Rep. 15: 63–64.  https://doi.org/10.23849/npafctr15/63.64.