Occurrence mechanism of strong-year classes in flathead flounder Hippoglossoides dubius by the assessment of transport process and prey abundance for larvae and juveniles
| Project/Area Number |
25450269
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Aquatic bioproduction science
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| Research Institution | Hokkaido University |
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Principal Investigator |
Takatsu Tetsuya 北海道大学, 水産科学研究科(研究院), 教授 (50241378)
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| Co-Investigator(Kenkyū-buntansha) |
HOSHI NAOKI 北海道大学, 水産学部, 助教 (50604485)
NAKAYA MITSUHIRO 北海道大学, 水産学部, 特任助教 (80604313)
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| Co-Investigator(Renkei-kenkyūsha) |
ISODA YUTAKA 北海道大学, 大学院水産科学研究院, 准教授 (10193393)
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| Research Collaborator |
INAGAKI YUTA
KANO YOTA
NAKATANI TOSHIKUNI
SUZUKI KOTA
TAMURA JUN'ICHI
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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| Keywords | アカガレイ / 仔魚 / 稚魚 / 着底 / 輸送 / 噴火湾 |
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| Outline of Final Research Achievements |
To clarify the occurrence mechanism of strong-year classes in flathead flounder Hippoglossoides dubius, transport process of pelagic larvae and juveniles and settled area of juveniles were investigated in Funka Bay and its vicinity in 2013-2015 FY. In May 2013, late pelagic stage larvae were collected with MOHT- and FMT-nets around the area off Muroran City located at the north-east end of the bay, but no larva was collected in 2014-2015. It might be important for the recruitment success in the 2013 year-class that the clockwise vortex off Muroran captured the larvae was retained by the predominantly northwesterly winds. In this vortex, suitable water temperature (4.1-5.6 degrees Celsius) and prey abundance were observed for larval growth. In contrast in August-December through 2013-2015, no settled juvenile was collected on the sea floor with an otter trawl net in and out of the bay with <98-m and 95-354-m bottom depths, respectively.
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Report
(4 results)
Research Products
(20 results)
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[Journal Article] Regeneration dynamics of iron and nutrients from bay sediment into bottom water of Funka Bay, Japan2015
Author(s)
N. Hioki, K. Kuma, Y. Morita, D. Miura, A. Ooki, S. Tanaka, H. Onishi, T. Takatsu, N. Kobayashi, Y. Kamei
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Journal Title
J. Oceanogr.
Volume: 71
Issue: 6
Pages: 703-714
DOI
NAID
Related Report
Peer Reviewed
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