| Project/Area Number |
11460086
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
General fisheries
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| Research Institution | The University of Tokyo |
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Principal Investigator |
WATANABE Yoshiro The University of Tokyo, Ocean Research Institute, Professor, 海洋研究所, 教授 (90280958)
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| Co-Investigator(Kenkyū-buntansha) |
SARUWATARI Toshiro The University of Tokyo, Ocean Research Institute, Assistant Professor, 海洋研究所, 助手 (00215899)
MATSUDA Hiroyuki The University of Tokyo, Ocean Research Institute, Associate Professor, 海洋研究所, 助教授 (70190478)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥11,100,000 (Direct Cost: ¥11,100,000)
Fiscal Year 2001: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2000: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1999: ¥4,900,000 (Direct Cost: ¥4,900,000)
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| Keywords | Population dynamics / Latitudinal difference / Clupeid fishes / Size at maturity / larval and juvenile growth / spawning ecology / 亜寒帯水域 / 亜熱帯水域 / 繁殖生態 / 初期生態 / ニシン / キビナゴ / 加入量変動 / 亜熱帯海域 / 亜寒帯海域 / マイワシ |
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| Research Abstract |
Ecological basis of the latitudinal differences in population dynamic of clupeid fishes was investigated, knowing that recruitment variability is as large as 2-3 order of magnitude in fish populations inhabiting the subarctic waters in contrast to 2-3 times difference in annual recruitment, levels in populations inhabiting the subtropical waters.
・ Spratelloides gracilis inhabiting tropical and subtropical waters in the western Pacific becomes matured in 3-4 months after hatching and has short generation time.
・ Etrumeus teres inhabiting the subtropical waters in the East China Sea and southern Japan becomes matures in 6 months and has prolonged spawning season almost year roud.
・ Sardinops melanostictus inhabiting temperate-subarctic waters is largely variable in recruitment and changes spawning and early life ecology associated with population size.
・ Clupea pallasii was weak in year class strength in 2000 but established a dominant year class in 2001 in Miyako Bay. Temperature and food availability were found to be important factors determining the year class strength.
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