| Project/Area Number |
59560181
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
General fisheries
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| Research Institution | University of Tokyo |
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Principal Investigator |
OKIYAMA Muneo Ocean Res. Inst., University of Tokyo. Professor, 海洋研究所, 助教授 (00111584)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1986: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1985: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1984: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Near-bottom biotope / Fish larvae and juveniles / Osmeridae / Salangidae / Larval fish Eaxonomy / キンメダイ |
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| Research Abstract |
The main purpose of this study is to clear the taxonomic problems and distributions of fish larvae and juveniles occurring in the immediate vicinity of the bottom, along with the development of the near-bottom ichtyoplankton sampler. Ecological implication of this assemblage is also considered.
1. Development of sampler: The near-bottom ichthyoplankton sampler modified from the Bongo-type plankton net is developed and tested in the fields. Despite necessary improvements, there remain several problems in the function of the opening and closing system and the mechanism adjusting the sampling depth.
2. Taxonomy of the near-bottom fish larvae and juveniles: Early developmental stages are described and illustrated with special references to those of the small-size Salmoniform fishes and the Myctophiform fishes. Those of the other groups are also included. They are Beryx splendens, Argentina kagoshimae, Calanthias japonicus, Erisphex potti,etc.
3. The concept of "the near-bottom larval fish assemblage" is discussed in terms of the ontogenetical, phylogenetical and ecological aspects. The schematic definition of the relevant ecosystem is preliminarily prosented suggesting the importance of the life history strategy associated with the feeding condition and the predation pressure.
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