Foraging and Growth of Hatchery-reared Honmasu Salmon Parr in a Natural River     

Arimune  Munakata Masafumi  Amano Shoji  Kitamura Kazumasa  Ikuta Katsumi  Aida 《Journal of the World Aquaculture Society》2005,36(3):411-415

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Effects of Low pH on Upstream Migratory Behavior in Land-Locked Sockeye Salmon Oncorhynchus nerka     

Ikuta  Kazumasa  Munakata  Arimune  Aida  Katsumi  Amano  Masafumi  Kitamura  Shoji 《Water, air, and soil pollution》2001,130(1-4):99-106

The effects of low pH on upstream migratory behavior in land-locked sockeye salmon Oncorhynchus nerka were examined using 2-way flow-through channels. Homing mature salmon captured at the mouth of their native stream were used. When neutral (pH 6.7) hatchery water of the same origin as native stream water was allowed to flow through both channels, fish showed active swimming into both channels during a 48 hrs period. When water pH in one channel was lowered by the addition of sulfuric acid, salmon completely ceased upstream swimming behavior into areas of pH lower than 6.0, and swam up into only neutral areas. In the lower pond of the 2-way channels, fish also avoided acidic areas even when average pH was 6.2. Since it has been reported that extremely slight changes in pH such as in the pH 6 range inhibits spawning behavior in this species, it is suggested that land-locked sockeye salmon have a sensitive ability to perceive even slight acidity, and avoid environments which may be deleterious to their offspring.  相似文献   

Involvement of sex steroids,luteinizing hormone and thyroid hormones in upstream and downstream swimming behavior of land-locked sockeye salmon <Emphasis Type="Italic">Oncorhynchus nerka</Emphasis>     

Arimune Munakata  Masafumi Amano  Kazumasa Ikuta  Shoji Kitamura  Katsumi Aida 《Fisheries Science》2012,78(1):81-90

The involvement of testosterone (T), estradiol-17β (E₂), 11-ketotestosterone (11-KT), 17,20β-dihydroxy-4-pregnene-3-one (DHP), luteinizing hormone (LH), thyroxine (T₄), and triiodothyronine (T₃) in the regulation of downstream and upstream movement (swimming behavior) was investigated in land-locked sockeye salmon Oncorhynchus nerka, using an artificial raceway. During the downstream migratory period, T implant resulted in high plasma T levels and inhibited the occurrence of downstream swimming behavior (negative rheotaxis) in yearling (1+) immature smolts. In terms of upstream behavior, 2-year-old (2+) males exhibited high plasma T and 11-KT levels, while 2+ females had elevated T and DHP levels. In 1+ immature fish, a T implant induced upstream swimming behavior (positive rheotaxis). In experiments 1 and 3, the plasma T₄ and T₃ levels of non-migrants tended to be higher than those of migrants. In contrast, no marked changes in plasma and pituitary LH were found in both downstream and upstream migrants. These results suggest that sex steroids, such as T, play significant roles in the regulation of downstream and upstream swimming behaviors in land-locked sockeye salmon.  相似文献   

Changes in Histidine and Anserine Levels in Hatchery-Reared Honmasu Salmon Parr after Release in a River   总被引：1，自引：0，他引：1  

Arimune  Munakata Katsumi  Aida Masafumi  Amano Kazumasa  Ikuta Shoji  Kitamura Hiroshi Y.  Ogata 《Journal of the World Aquaculture Society》2000,31(2):274-278

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