Recent Analyses of Chum Salmon Homing Migration from the Bering Sea to Japan
نویسندگان
چکیده
Hideji Tanaka, Tomoko Kitani, Masafumi Amano, Yuzo Yamamoto, Takayuki Shoji, Shigehiko Urawa, Masatoshi Ban, Masa-aki Fukuwaka, Yasuhiko Naito, and Hiroshi Ueda Biosphere Informatics, Department of Social Informatics, Kyoto University, Kyoto 606-8501, Japan Laboratroy of Aquatic Ecosystem Conservation, Graduate School of Fisheries Science, Hokkaido University, Sapporo 060-0809, Japan Laboratory of Fish Physiology, School of Fisheries Science, Kitazato University, Ofunato 022-0101, Japan Department of Fisheries, School of Marine Science and Technology, Tokai University, Shizuoka 424-8610, Japan National Salmon Resources Center, Sapporo 062-0922, Japan Hokkaido National Fisheries Research Institute, Fisheries Research Agency, Kushiro 085-0802, Japan National Institute of Polar Research, Tokyo 173-8515, Japan Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan
منابع مشابه
Potential Role of the Magnetic Field on Homing in Chum Salmon (Oncorhynchus keta) Tracked from the Open Sea to Coastal Japan
In order to examine the Earth’s magnetic intensity and inclination during homing migration of chum salmon (Oncorhynchus keta) and to present tracking data consistent with the geomagnetic imprinting hypothesis that salmon migrate homeward using the Earth’s magnetic intensity or inclination, archival tagging operations were carried out in the Bering Sea in 2012 and 2013. DST magnetic tags were at...
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An increase in activity of the pituitary-gonadal axis (PG-axis) and gonadal development are essential for the onset of spawning migration of chum salmon from the Bering Sea. In the Bering Sea, fish with larger body sizes initiated gonadal development and commenced spawning migration to the natal river by the end of summer. We thus hypothesized that insulin-like growth factor-I (IGF-I), a somato...
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The olfactory hypothesis for salmon imprinting and homing to their natal stream is well known, but the endocrine hormonal control mechanisms of olfactory memory formation in juveniles and retrieval in adults remain unclear. In brains of hatchery-reared underyearling juvenile chum salmon (Oncorhynchus keta), thyrotropin-releasing hormone gene expression increased immediately after release from a...
متن کاملExpression of GnRH genes is elevated in discrete brain loci of chum salmon before initiation of homing behavior and during spawning migration.
Our previous studies suggested the importance of gonadotropin-releasing hormones (GnRHs) for initiation of spawning migration of chum salmon, although supporting evidence had been not available from oceanic fish. In farmed masu salmon, the amounts of salmon GnRH (sGnRH) mRNAs in the forebrain increased in the pre-pubertal stage from winter through spring, followed by a decrease toward summer. W...
متن کاملTrends in Abundance and Feeding of Chum Salmon in the Western Bering Sea
Results from surveys of the western Bering Sea and adjacent Pacific epipelagic waters, performed by TINRO-Centre are reported. Surveys of the nekton community were conducted from 1986 through 2005, annually. Information on the distribution of all chum salmon by age group, the abundance and biomass of chum salmon, and other fish in the western Bering Sea and adjacent Pacific Ocean water are repo...
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