ECOLOGICAL STUDIES ON THE GUPPY, LEBISTES RETICULATUS (PETERS) : III. ON THE GUPPY POPULATION ACCLIMATIZED IN A WATER OF TOGURA-KAMIYAMADA SPA

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  • YAMAGISHI Hiroshi
    Department of Fisheries, Faculty of Agriculture, The University of Tokyo
  • OKINO Tokio
    Department of Biology, Faculty of Science, Tokyo Metropolitan University
  • NAKAMOTO Nobutada
    Department of Biology, Faculty of Science, Tokyo Metropolitan University
  • NAKAMURA Yuzuru
    Department of Parasitology, Institute for Infectious Diseases, The University of Tokyo
  • WADA Yoshitake
    Department of Parasitology, Institute for Infectious Diseases, The University of Tokyo

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Other Title
  • グッピーの生態学的研究 : III.戸倉・上山田温泉の湯尻に環境順化したグッピー個体群について
  • グッピーの生態学的研究-3-戸倉・上山田温泉の湯尻に環境順化したグッピー個体群について
  • グッピー ノ セイタイガクテキ ケンキュウ 3 トクラ カミノヤマデン オンセン ノ トウジリ ニ カンキョウジュンカ シタ グッピー コタイグン ニ ツイテ

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Abstract

Regular surveys were made in 1965-1966 of the guppy population, which had been acclimatized in a short stream of polluted hot spring water in Togura-Kamiyamada spa (N 36°29', E 138°05') about ten years ago. Water temperature of the habitat was maintained at about 20℃ even in winter. These guppies were not cold-resistant. They showed so rapid growth and so great fecundity that they could attain an extreme high level in number (more than 2000/m^2). In summer they began to disperse to irrigation streams and rice fields, and the population number of the guppies in the short stream remarkably decreased. The guppies were euryphageous and they ate even attached bacteria and deposits of the stream. Four characters of tail figure were observed in the male fish. No tendency of shortening in tail length of the male in the natural conditions was observed.

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