Evaluation of the stock enhancement of chum salmon inJapan using stable isotope retrospective analysis.
| Project/Area Number |
22580209
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
General fisheries
|
|---|
| Research Institution | Kitasato University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2010 – 2012
|
| Project Status |
Completed (Fiscal Year 2012)
|
| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
|
|---|
| Keywords | 水産資源 / 資源変動 / 環境変動 / 安定同位体 / サケ / レジームシフト / 餌 / 窒素安定同位体比 / 酸素安定同位体比 / 鱗 / 無機炭素 / 生息水温 / 資源管理 / シロザケ / 水温 |
|---|
| Research Abstract |
Chum salmon population in Iwate prefecture has declined in catch for these years, although the numbers of juvenile release remained constant. To elucidate the cause of such decrease, stable isotope ratios of fish scales of chum salmon were measured. As results, carbon and nitrogen stable isotope ratiosof muscle and marginal parts of fish scales are positively correlated. This finding suggested fish scales remain stable isotopic signature of pray items. The carbon and nitrogen stable isotopic signatures of second year in oceanic life stage were lower for both Iwate and Hokkaido populations. This finding suggested Japanese chum salmon might have depended on lower level of food web as food items at relatively early stage in its life history.
|
Report
(4 results)
Research Products
(4 results)
