Journal of National Fisheries University

PISSN : 0370-9361

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Journal of National Fisheries University Volume 60 Issue 1
published_at 2011-10

A Pelagic Cyprinid of Lake Biwa Gnathopogon caerulescens and a Brooklet-Dwelling Relative G. elongatus formed a Hybrid Swarm in a Dammed Reservoir Lake Ono

A Pelagic Cyprinid of Lake Biwa Gnathopogon caerulescens and a Brooklet-Dwelling Relative G. elongatus formed a Hybrid Swarm in a Dammed Reservoir Lake Ono
Nakashima Norihisa
Uno Takashi
Kitagawa Shinsuke
Kuwahara Masayuki
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60-1-43-50.pdf
Descriptions
planktivorous pelagic cyprinid of Lake Biwa Gnatopogon caeruleslens was transplanted to a dammed reservoir Lake Ono in Yamaguchi Prefecture in 1953, but nowadays fish seemingly intermediate between G. caerulescens and a brooklet-dwelling relative G. elongatus has propagated. Morphological and genetic comparisons clearly revealed the Lake Ono fish intermediacy between G. caerulescens and G. elongatus and strongly suggested that the Lake Ono opulation is a hybrid swarm between them. In order to transplant G. caerulescens to other waters from Lake Biwa hereafter, it should be introduced to sufficiently large and deep lakes capable of assuring its pelagic and planktivorous lifestyle, and contamination of G. elongatus should be eliminated at the same time.
Creator Keywords
Cyprinidae
Lake Biwa
transplantation
hybrid swarm
morphology
allozyme
mitochondrial DNA