Genetic diversity and origin of Florida largemouth bass (Micropterus salmoides floridanus) introduced into Lake Biwa inferred from the mitochondrial DNA control region

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  • Aoki Daisuke
    Gairaigyo Busters (NPO):Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • Nakayama Yuichiro
    Gairaigyo Busters (NPO):Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • Hayashi Masahito
    Gairaigyo Busters (NPO):Graduate School of Information Science and Technology, The University of Tokyo:ERATO Quantum Computation and Information Project, Japan Science and Technology Agency
  • Iwasaki Gyosei
    Gairaigyo Busters (NPO)

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  • 琵琶湖におけるオオクチバスフロリダ半島産亜種(Micropterus salmoides floridanus)のミトコンドリアDNA調節領域の多様性と導入起源
  • ビワコ ニ オケル オオクチバス フロリダ ハントウサン アシュ Micropterus salmoides floridanus ノ ミトコンドリア DNA チョウセツ リョウイキ ノ タヨウセイ ト ドウニュウ キゲン

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Abstract

To determine the origin of Florida largemouth bass (Micropterus salmoides floridanus) introduced into Lake Biwa, haplotype variation in the control region of mitochondrial DNA (mtDNA) of largemouth bass (Micropterus salmoides) was analyzed for 107 individuals from Lake Biwa and Lake Nishinoko (the Lake Biwa region), 39 individuals from Ikehara Reservoir, and 10 individuals from a fishery company that had previously cultivated Florida largemouth bass. Based on direct sequencing or single-strand conformation polymorphism (SSCP) analysis of the mtDNA control region, 3 haplotypes belonging to northern largemouth bass (M. s. salmoides) and 10 haplotypes belonging to Florida largemouth bass were identified. All four Florida largemouth bass haplotypes from the Lake Biwa region were also observed in Ikehara Reservoir. In contrast, all 10 individuals from the fishery company showed only one haplotype, which belonged to northern largemouth bass. Analysis of molecular variance (AMOVA) based on haplotype frequency indicated heterogeneity among populations within the Lake Biwa region. These results suggest that Florida largemouth bass of the same lineages as those found in Ikehara Reservoir were released multiple times in the Lake Biwa region.

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