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Papers by HIROSHI UEDA
Japanese Journal of Limnology (Rikusuigaku Zasshi), 2004
Journal of Molecular Endocrinology, 1999
Changes in the levels of pituitary mRNAs encoding GH, prolactin (PRL) and somatolactin (SL) were ... more Changes in the levels of pituitary mRNAs encoding GH, prolactin (PRL) and somatolactin (SL) were determined in pre-spawning chum salmon (Oncorhynchus keta) caught at a few key points along their homing pathway in 1994 and 1995. Furthermore, we analyzed relationships between expression of pituitary-specific POU homeodomain transcription factor (Pit-1/GHF-1) and GH/PRL/SL family genes. In 1994, seawater (SW) fish and matured fresh-water (FW) fish were sequentially captured at two points along their homing pathway, the coast and the hatchery. In addition to these two points, maturing FW fish were captured at the intermediate of the two points in 1995. The levels of hormonal mRNAs were determined by a quantitative dot blot analysis using single-stranded sense DNA as the standard. Relative levels of Pit-1/GHF-1 mRNAs were estimated by Northern blot analysis. In 1994, the levels of GH/PRL/SL family mRNAs except for PRL mRNA in the male FW fish were 1.8-4 times higher than those in the SW ...
Journal of Fish Biology, 2009
NIPPON SUISAN GAKKAISHI, 2010
Memoirs of National Institute of Polar Research Special Issue, Mar 1, 2004
General and Comparative Endocrinology, 2008
NIPPON SUISAN GAKKAISHI, 2005
Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology, 2007
Journal of Fish Diseases, 2018
A number of studies have investigated the amazing abilities of salmon to migrate long distances f... more A number of studies have investigated the amazing abilities of salmon to migrate long distances from the ocean to their natal streams for spawning, but much remains unknown because of the difficulties in following the whole life cycle, especially the oceanic migration. Kokanee Oncorhynchus nerka (lacustrine sockeye salmon), offer promise as systems for studying the physiological mechanisms of homing ability in salmon. Three types of physiological study, from behavior to molecules, were conducted using Lake Toya and Lake Shikotsu, Hokkaido, Japan, as model "oceans" and are reviewed here. The first study examined homing behavior of mature sockeye salmon in Lake Toya using ultrasonic tracking systems, testing for use of visual cues and magnetic orientation. Visual cues, but not magnetic orientation, appeared to be important in straight homing behavior. The second study examined the effect of hormonal controlling mechanisms, in relation to sexual differences, on homing duratio...
Japanese Journal of Limnology (Rikusuigaku Zasshi), 2004
Journal of Molecular Endocrinology, 1999
Changes in the levels of pituitary mRNAs encoding GH, prolactin (PRL) and somatolactin (SL) were ... more Changes in the levels of pituitary mRNAs encoding GH, prolactin (PRL) and somatolactin (SL) were determined in pre-spawning chum salmon (Oncorhynchus keta) caught at a few key points along their homing pathway in 1994 and 1995. Furthermore, we analyzed relationships between expression of pituitary-specific POU homeodomain transcription factor (Pit-1/GHF-1) and GH/PRL/SL family genes. In 1994, seawater (SW) fish and matured fresh-water (FW) fish were sequentially captured at two points along their homing pathway, the coast and the hatchery. In addition to these two points, maturing FW fish were captured at the intermediate of the two points in 1995. The levels of hormonal mRNAs were determined by a quantitative dot blot analysis using single-stranded sense DNA as the standard. Relative levels of Pit-1/GHF-1 mRNAs were estimated by Northern blot analysis. In 1994, the levels of GH/PRL/SL family mRNAs except for PRL mRNA in the male FW fish were 1.8-4 times higher than those in the SW ...
Journal of Fish Biology, 2009
NIPPON SUISAN GAKKAISHI, 2010
Memoirs of National Institute of Polar Research Special Issue, Mar 1, 2004
General and Comparative Endocrinology, 2008
NIPPON SUISAN GAKKAISHI, 2005
Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology, 2007
Journal of Fish Diseases, 2018
A number of studies have investigated the amazing abilities of salmon to migrate long distances f... more A number of studies have investigated the amazing abilities of salmon to migrate long distances from the ocean to their natal streams for spawning, but much remains unknown because of the difficulties in following the whole life cycle, especially the oceanic migration. Kokanee Oncorhynchus nerka (lacustrine sockeye salmon), offer promise as systems for studying the physiological mechanisms of homing ability in salmon. Three types of physiological study, from behavior to molecules, were conducted using Lake Toya and Lake Shikotsu, Hokkaido, Japan, as model "oceans" and are reviewed here. The first study examined homing behavior of mature sockeye salmon in Lake Toya using ultrasonic tracking systems, testing for use of visual cues and magnetic orientation. Visual cues, but not magnetic orientation, appeared to be important in straight homing behavior. The second study examined the effect of hormonal controlling mechanisms, in relation to sexual differences, on homing duratio...