Geographic Origin of High-Seas Chum Salmon Determined by Genetic and Thermal Otolith Markers

• Main Authors: Shigehiko Urawa L, Morihiko Kawana L, Gen Anma, Yoshihiko Kamei, Takayuki Shoje, Masa-aki Fukuwaka, Kristen M. Munk, Katherine W. Myers, Edward V. Farley, M. Kawana, G. Anma, Y. Kamei, T. Shoji, M. Fukuwaka, K. M. Munk, K. W. Myers
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Gulf of Alaska; Ketal; Kodiak; Alaska
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.7956; http://www.npafc.org/new/publications/Bulletin/Bulletin No. 2/pages 283-290(Urawa).PDF

and thermal otolith markers. N. Pac. Anadr. Fish Comm. Bull. No.2: 283-290. Keywords: Chum salmon, stock origin, Gulf of Alaska, thermal otolith mark, genetic stock identification Abstract: Genetic stock identification (GSI) and thermal otolith marking techniques were used for determining the stock origin of chum salmon (Oncorhynchus ketal caught in two offshore transects (165°W and 145°W) in the Gulf of Alaska during June and July 1998. In the central Gulf of Alaska (49-56°N, 145°W), 49 thermally-marked chum salmon were found (14.5%, n = 339 fish). Most of these marked salmon were immature fish originated from four hatcheries in southeast Alaska (SEAK) and Prince William Sound (PWS), while two immature fish were from Nitinat Hatchery on southwest Vancouver Island, British Columbia (BG). In the western Gulf of Alaska (45-50 o N, 165°W), however, we found only two marked chum salmon (1.1 %, n = 188 fish) that had been released from the Hidden Falls and Gastineau hatcheries in SEAK. The GSI results indicated that North American chum salmon were common in the central Gulf of Alaska (15 % west Alaska, 25% Alaska Peninsula/Kodiak, 28 % SEAKlPWS, and 18 % BC stocks), and Asian chum salmon were