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Studies on Oryzias Fishes for Assessment of Environmental Condition

Studies on Oryzias Fishes for Assessment of Environmental Condition. Koji INOUE. Center for International Cooperation Ocean Research Institute, The University of Tokyo. The genus Oryzias contains nearly 20 small fish species Distributed in in Asia.

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Studies on Oryzias Fishes for Assessment of Environmental Condition

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  1. Studies on Oryzias Fishes for Assessment of Environmental Condition Koji INOUE Center for International Cooperation Ocean Research Institute, The University of Tokyo

  2. The genus Oryzias contains nearly 20 small fish species Distributed in in Asia Each species exhibits specific distribution patterns (NOT disturbed by human activity) and different adaptability to seawater (Albert and Naruse, 2000)

  3. FW/(BW) BW/FW O. latipes (Japanese) medaka O. dancena Indian medaka O. javanicus Javanese medaka O. marmoratus Marmoratus medaka FW SW/BW

  4. SW-adaptability of the four Oryzias fishes (Inoue and Takei, 2002; 2003)

  5. Use of Oryzias species for Environmental studies: 1. Use of SW-adaptable species as model of SW fish. 2. Assessment of environmental condition from distribution area of Oryzias species. 3. Survey of pollution using transgenic fish.

  6. Use of Oryzias species for Environmental studies: 1. Use of SW-adaptable species as model of SW fish. SW-adaptable species: O. javanicus (Indian medaka), O. dancena (Javanese medaka) Extent of genetic diversity among local strains ? Sampling of the two species at different places and genetic analyses are necessary.

  7. Sampling of O. dancena and O. javanicus in Malaysia (Feb. 2007)

  8. Malaysia10 Malaysia9 Malaysia8 Malaysia7 100 Malaysia6 Malaysia5 Malaysia4 86 Malaysia3 Malaysia2 53 Malaysia1 100 Oryzias dancena: India 71 Oryzias dancena: Thai Oryzias minutillus 94 34 Oryzias javanicus Oryzias hubbsi Xenopoecilus oophorus 63 Oryzias celebensis 66 98 Oryzias nigrimas 48 Xenopoecilus sarasinorum 52 96 Oryzias matanensis Oryzias marmoratus Oryzias profundicola 41 Oryzias mekongensis 56 Oryzias latipes 81 Oryzias curvinotus Oryzias luzonensis Cypselurus pinnatibarbatus japonicus Cololabis saira 0.02 NJ tree using 12S rDNA

  9. National BioResource Project: Medaka

  10. NBRP: Medaka@ National Inst. for Basic Biology, Okazaki, Japan

  11. Use of Oryzias species for Environmental studies: 1. Use of SW-adaptable species as model of SW fish. 2. Assessment of environmental condition from distribution area of Oryzias species. International collaboration is necessary. Meeting to establish research group for Oryzias species other than O. latipes.

  12. THE INTERNATIONAL SYMPOSIUM OF ORYZIAS FISHES New Asian Resources for Basic and Applied Science 12th-14th November, 2007; Bangkok, Thailand Organizing committee: Wichian Magtoon, Srinakharinwirot University, Thailand Satoshi Hamaguchi, Niigata University, Japan Kiyoshi Naruse, National Institute for Basic Biology, Japan Koji Inoue, The University of Tokyo, Japan Masaru Nonaka, The University of Tokyo, Japan

  13. Medaka symposium and sampling of Thai medaka (Nov. 2007)

  14. Sampling of O. javanicus in Malaysia (Nov. 2007)

  15. Discussion article in SOKENDAI Journal (Jan. 2008)

  16. Thank you !

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