studies on oryzias fishes for assessment of environmental condition
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Studies on Oryzias Fishes for Assessment of Environmental Condition
Koji INOUE
Center for International CooperationOcean Research Institute, The University of Tokyo
(Albert and Naruse, 2000)
The genus Oryzias containsnearly 20 small fish speciesDistributed in in Asia
Each species exhibits specific distribution patterns
(NOT disturbed by human activity)
and different adaptability to seawater
O. latipes(Japanese) medaka
O. dancenaIndian medaka
O. javanicusJavanese medaka
BW/FW
SW/BW
FW/(BW)
FW
O. marmoratusMarmoratus medaka
Species
（ Habitat ）O. marmoratus
(FW)
O. latipes
(FW/BW)
O.dancena
(BW/FW)
O. javanicus
(SW/BW)
Adaptability of
Adult fish – + + +Spawning in
SWND + + +
Fertilization in
SWND + + +
Embryonic
Development in SW – + + +Hatching in SW ND + + +
SW-adaptability of the four Oryzias fishes(Inoue and Takei, 2002; 2003)
Use of Oryzias species forEnvironmental 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.
Use of Oryzias species forEnvironmental 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 placesand genetic analyses are necessary.
Sampling of O. dancena and O. javanicus in Malaysia (Feb. 2007)
Malaysia8 Malaysia9
Malaysia7 Malaysia6 Malaysia5 Malaysia4 Malaysia3 Malaysia2 Malaysia1
Malaysia10
Oryzias dancena: India Oryzias dancena: Thai
Oryzias minutillus Oryzias javanicus
Oryzias hubbsi Xenopoecilus oophorus
Oryzias celebensis Oryzias nigrimas
Xenopoecilus sarasinorum Oryzias matanensis Oryzias marmoratus Oryzias profundicola
Oryzias mekongensis Oryzias latipes
Oryzias curvinotus Oryzias luzonensis
Cypselurus pinnatibarbatus japonicus Cololabis saira
0.02
100
100
81
53
94
71
86
63
5641
48
34
6698
9652
NJ tree using 12S rDNA
National BioResource Project: Medaka
NBRP: Medaka@ National Inst. for Basic Biology, Okazaki, Japan
Use of Oryzias species forEnvironmental 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.
New Asian Resources for Basic and Applied Science
THE INTERNATIONAL SYMPOSIUMOF ORYZIAS FISHES
12th-14th November, 2007; Bangkok, Thailand
Organizing committee:Wichian Magtoon, Srinakharinwirot University, ThailandSatoshi Hamaguchi, Niigata University, JapanKiyoshi Naruse, National Institute for Basic Biology, Japan Koji Inoue, The University of Tokyo, Japan Masaru Nonaka, The University of Tokyo, Japan
Medaka symposium and sampling of Thai medaka (Nov. 2007)
Sampling of O. javanicus in Malaysia (Nov. 2007)
Discussion article in SOKENDAI Journal (Jan. 2008)
Thank you !