1999 Fiscal Year Annual Research Report

ウナギ魚類の起源と進化に関する研究

Research Project

Project/Area Number	11691177
Research Category	Grant-in-Aid for Scientific Research (A)
Section	一般
Research Institution	The University of Tokyo
Principal Investigator	塚本勝巳東京大学, 海洋研究所, 教授 (10090474)
Co-Investigator(Kenkyū-buntansha)	小川和夫東京大学, 農学生命科学研究科, 助教授 (20092174) 金子豊二東京大学, 海洋研究所, 助教授 (70221190) 西田睦東京大学, 海洋研究所, 教授 (90136896) 青山潤日本学術振興会, 特別研究員大竹二雄三重大学, 生物資源学部, 助教授 (20160525)
Keywords	ウナギ / 回遊 / 進化 / 適応機構 / 分子系統 / 塩類細胞 / 耳石 / mtDNA
Research Abstract	1.空間的アプローチ(回遊メカニズムの解明) (1)スラウェシ島のポイガル川河口で採集したシラスウナギの耳石から日齢査定を行い、Anguilla celebesensis,A.marmorata,A.bicolor pacificaの接岸日齢はおよそ109日,155日,173日であることを明らかにした。一方,ニュージーランドのA.australisは226日で接岸していた。熱帯ウナギの仔魚期間は温帯ウナギのそれに比較して短いことがわかった。(2)2000年1月14日〜3月10日,南太平洋およびセレベス海でウナギの回遊生態を調査し,ウナギ属レプトケファルス計21個体を得た。セレベス海ではふ化後間もない体長7mmの前期仔魚と,最大伸長期に近い47.4mmの個体が同一地点で採集されたことから,セレベス海にはいずれの種かの産卵場があり,また,熱帯ウナギは局地的小規模回遊をしていることが示唆された。 2.時間的アプローチ(種分化過程・類縁系統関係の解明) (1)インド・太平洋一帯から得たA.marmorata計240個体のmtDNAおよび核DNAを解析した結果,本種には遺伝的に明らかに異なる6つの集団の存在することがわかった。これらはレプトケファルスの輸送を支配する海洋の水塊構造とほぼ対応していた。(2)ウナギ属魚類全種の内部骨格を比較したところ,種間の形態的差異は極めて小さかった。今後,遺伝子データと合わせてウナギ属の類縁系統関係を解明する。(3)世界各地より得たウナギ属魚類計800個体から単生類Pseudodactylogyrusの7種を採集した。ウナギ寄生のPseudodactylogyrusの宿主特異性は低く,種間の遺伝的差異はごく小さいことがわかった。これより,Pseudodactylogyrusはウナギと共進化したというより、むしろ他の魚類から宿主転換してウナギで比較的最近に種分化したものと考えられた。

Research Products

(23 results)

All Other

All Publications (23 results)

[Publications] 塚本勝巳: "産卵場:白鳳丸航海'98"月刊海洋. 号外No.18. 12-19 (1999)
[Publications] 西田睦: "ウナギの集団構造"月刊海洋. 号外No.18. 60-64 (1999)
[Publications] 金子豊二: "胚期・仔魚期の浸透圧調節と塩類細胞"月刊海洋. 号外No.18. 130-134 (1999)
[Publications] 大竹二雄: "ウナギ仔魚の変態と回遊"月刊海洋. 号外No.18. 46-52 (1999)
[Publications] AOYAMA, Jun: "Swimming depth of migrating silver eels anguilla japonica released at seamounts of the West Marinana Ridge,their estimated spawning sites"Marine Ecology Progress Series. 186. 265-269 (1999)
[Publications] AOYAMA, Jun: "Distribution and dispersal of anguillid leptocephali in the western Pasific revealed by molecular analysis"Marine Ecology Progress Series. 188. 193-200 (1999)
[Publications] 青山潤: "ウナギの起源と進化"月刊海洋. 号外No.18. 69-74 (1999)
[Publications] ISHIKAWA, Satoshi: "Molecular genetic approach to the ecology of the freshwater eel, genus Anguilla"Proceedings of Symposium on Molecular Bioengineering of Food Animals. 81-89 (1999)
[Publications] 石川智士: "オオウナギの集団構造"月刊海洋. 号外No.18. 65-68 (1999)
[Publications] ARAI,Takaomi: "Metamorphosis and inshore migration of tropical eels, Anguilla spp., in the Indo-Pacific"Marine Ecology Progress Series. 182. 283-293 (1999)
[Publications] ARAI, Takaomi: "Species compositin and inshore migration of the tropical eels Anguilla spp. recruiting to the estuary of the Poigar River, Sulawesi Island"Marine Ecology Progress Series. 188. 299-303 (1999)
[Publications] ARAI,Takaomi: "Early life history and recruitment of the tropical eel,Anguilla bicolor pacifica,as revealed by otolith microstructure and microchemistry"Marine Biology. 133. 319-326 (1999)
[Publications] ARAI, Takaomi: "Differences in the early life history of the Australasian shortfinned eel, Anguilla australis from Australia and New Zealand, as revealed by otolith microstructure and microchemistry"Marine Biology. 162. 381-389 (1999)
[Publications] ARAI, Takaomi: "Diversity of tropical Anguillid eels : early life history and migration"Proceedings of the 9th JSPS Joint Seminar on Marine and Fisheries Sciences. 215-228 (1999)
[Publications] OTAKE, Tsuguo: "Distribution of Anguilla japonica leptocephali around Arakane and Pathfinder Seamounts"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)
[Publications] AOYAMA, Jun: "Tracking of hormone treated japanese eel, Anguilla japonica, at Seamounts as their estimated spawning sites"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)
[Publications] AOYAMA, Jun: "Are morphological characters distinctive enough to discriminate between two species of freshwater eels, Anguilla celebesensis and A. interioris?"Icthyological Research. (in press). (2000)
[Publications] ISHIKAWA, Satoshi: "Sampling of Anguilla japonica eggs around Seamounts area"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)
[Publications] ARAI, Takaomi: "Validation of otolith daily increments in the tropical eel, Anguilla celebesensis"Canadian Journal of Zoology. (in press). (2000)
[Publications] FRICKE, Hans: "Eel survey and eel spawning"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)
[Publications] MOCHIOKA, Noritaka: "Anguilla marmorata leptocephali"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)
[Publications] MOCHIOKA, Noritaka: "Anguilliform and notacanthiform leptocephali"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)
[Publications] SUZUKI, Yuzuru: "Adult eel sampling"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)

1999 Fiscal Year Annual Research Report

ウナギ魚類の起源と進化に関する研究

Principal Investigator

塚本 勝巳 東京大学, 海洋研究所, 教授 (10090474)

Research Products

[Publications] 塚本勝巳: "産卵場:白鳳丸航海'98"月刊 海洋. 号外No.18. 12-19 (1999)

[Publications] 西田 睦: "ウナギの集団構造"月刊 海洋. 号外No.18. 60-64 (1999)

[Publications] 金子豊二: "胚期・仔魚期の浸透圧調節と塩類細胞"月刊 海洋. 号外No.18. 130-134 (1999)

[Publications] 大竹二雄: "ウナギ仔魚の変態と回遊"月刊 海洋. 号外No.18. 46-52 (1999)

[Publications] AOYAMA, Jun: "Swimming depth of migrating silver eels anguilla japonica released at seamounts of the West Marinana Ridge,their estimated spawning sites"Marine Ecology Progress Series. 186. 265-269 (1999)

[Publications] AOYAMA, Jun: "Distribution and dispersal of anguillid leptocephali in the western Pasific revealed by molecular analysis"Marine Ecology Progress Series. 188. 193-200 (1999)

[Publications] 青山 潤: "ウナギの起源と進化"月刊 海洋. 号外No.18. 69-74 (1999)

[Publications] ISHIKAWA, Satoshi: "Molecular genetic approach to the ecology of the freshwater eel, genus Anguilla"Proceedings of Symposium on Molecular Bioengineering of Food Animals. 81-89 (1999)

[Publications] 石川智士: "オオウナギの集団構造"月刊 海洋. 号外No.18. 65-68 (1999)

[Publications] ARAI,Takaomi: "Metamorphosis and inshore migration of tropical eels, Anguilla spp., in the Indo-Pacific"Marine Ecology Progress Series. 182. 283-293 (1999)

[Publications] ARAI, Takaomi: "Species compositin and inshore migration of the tropical eels Anguilla spp. recruiting to the estuary of the Poigar River, Sulawesi Island"Marine Ecology Progress Series. 188. 299-303 (1999)

[Publications] ARAI,Takaomi: "Early life history and recruitment of the tropical eel,Anguilla bicolor pacifica,as revealed by otolith microstructure and microchemistry"Marine Biology. 133. 319-326 (1999)

[Publications] ARAI, Takaomi: "Differences in the early life history of the Australasian shortfinned eel, Anguilla australis from Australia and New Zealand, as revealed by otolith microstructure and microchemistry"Marine Biology. 162. 381-389 (1999)

[Publications] ARAI, Takaomi: "Diversity of tropical Anguillid eels : early life history and migration"Proceedings of the 9th JSPS Joint Seminar on Marine and Fisheries Sciences. 215-228 (1999)

[Publications] OTAKE, Tsuguo: "Distribution of Anguilla japonica leptocephali around Arakane and Pathfinder Seamounts"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)

[Publications] AOYAMA, Jun: "Tracking of hormone treated japanese eel, Anguilla japonica, at Seamounts as their estimated spawning sites"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)

[Publications] AOYAMA, Jun: "Are morphological characters distinctive enough to discriminate between two species of freshwater eels, Anguilla celebesensis and A. interioris?"Icthyological Research. (in press). (2000)

[Publications] ISHIKAWA, Satoshi: "Sampling of Anguilla japonica eggs around Seamounts area"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)

[Publications] ARAI, Takaomi: "Validation of otolith daily increments in the tropical eel, Anguilla celebesensis"Canadian Journal of Zoology. (in press). (2000)

[Publications] FRICKE, Hans: "Eel survey and eel spawning"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)

[Publications] MOCHIOKA, Noritaka: "Anguilla marmorata leptocephali"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)

[Publications] MOCHIOKA, Noritaka: "Anguilliform and notacanthiform leptocephali"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)

[Publications] SUZUKI, Yuzuru: "Adult eel sampling"Preliminary Report of The Hakuho Maru Cruise KH98-2. (in press). (2000)

塚本勝巳東京大学, 海洋研究所, 教授 (10090474)

[Publications] 塚本勝巳: "産卵場:白鳳丸航海'98"月刊海洋. 号外No.18. 12-19 (1999)

[Publications] 西田睦: "ウナギの集団構造"月刊海洋. 号外No.18. 60-64 (1999)

[Publications] 金子豊二: "胚期・仔魚期の浸透圧調節と塩類細胞"月刊海洋. 号外No.18. 130-134 (1999)

[Publications] 大竹二雄: "ウナギ仔魚の変態と回遊"月刊海洋. 号外No.18. 46-52 (1999)

[Publications] 青山潤: "ウナギの起源と進化"月刊海洋. 号外No.18. 69-74 (1999)

[Publications] 石川智士: "オオウナギの集団構造"月刊海洋. 号外No.18. 65-68 (1999)