The occurrence and run timing of naturally spawning chum salmon in northern Japan - Yasuyuki Miyakoshi; Hirokazu Urabe; Hayato Saneyoshi; Tomoya Aoyama; Hiroyuki Sakamoto; Daisei Ando; Kiyoshi Kasugai; Yoshio Mishima; Masayuki Takada; Mitsuhiro Nagata (Environmental Biology of Fishes, 2012)