Lowering trend in the age of seaward migration and its relationship to environmental and physiological factors in masu salmon Oncorhynchus masou
Project/Area Number |
24580257
|
Research Category |
Grant-in-Aid for Scientific Research (C)
|
Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
General fisheries
|
Research Institution | Miyagi University of Education |
Principal Investigator |
|
Project Period (FY) |
2012-04-01 – 2015-03-31
|
Project Status |
Completed (Fiscal Year 2014)
|
Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
|
Keywords | サクラマス / oncorhynchus masou / 広瀬川 / 回遊 / 降河行動 / スチールヘッドトラウト / マスノスケ / 行動 / 銀化変態 / 降河鼓動 / コルチゾル / 甲状腺ホルモン / サツキマス / 降河回遊 / ストレス / 水温 / 発信器 / 降河 / 遡上 / 気候変動 / masu salmon / migration |
Outline of Final Research Achievements |
In Hirose River, major part of masu salmon Oncorhynchus masou showed seaward migration in under yearling fall, which is 6 months earlier than the migrants inhabit in other rivers. Also, such under yearling migrants undertake half year migration in coastal area and show upstream migration in yearling spring. In order to reveal the mechanism modulating such migratory pattern, we investigated the effects of water temperature changes on swimming behavior of under yearling steelhead trout. As a result, we found that steelhead juveniles avoid high water temperature zone. Hence, it appears that increase of water temperature influences habitat choice and migratory patterns. We also found that under yearling Chinook salmon which stayed in upper and lower column of an aquarium showed downstream migratory behavior during under yearling fall and yearling spring, respectively. Such phenomenon implied that we can enhance migration during under yearling stage by modulating rearing conditions.
|
Report
(4 results)
Research Products
(22 results)
-
-
-
-
-
-
-
-
-
[Presentation] Is Juvenile migration phenotype established by recent stimuli or much earlier in life and can they be affected by hatchery practices?2015
Author(s)
Schreck, C.B., Billman, E.J. Unrein, J., Chitwood, R., Whitman, L.D., Schroeder, R.K., Sharpe, C.S., Kimmel, C., Brignon, B., Munakata, A., and Noakes, D.L.G.
Organizer
Hatchery vs. Wild salmonid Symposium
Place of Presentation
Portaland. Oregon. USA
Year and Date
2015-01-22 – 2015-01-23
Related Report
-
-
-
-
-
-
-
-
-
-
-
-
-