Annual changes in abundance of bluegill <I>Lepomis macrochirus</I> in the south basin of Lake Biwa

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  • Sakai Akihisa
    Shiga Prefectural Fisheries Experiment Station
  • Saegusa Jin
    Shiga Prefectural Fisheries Experiment Station Shiga Prefecture Fisheries Management Division
  • Taguchi Takashi
    Shiga Prefectural Fisheries Experiment Station
  • Usuki Takahiro
    Shiga Prefectural Fisheries Experiment Station Shiga Prefecture Fisheries Management Division
  • Uegaki Masashi
    Shiga Prefectural Fisheries Experiment Station Shiga Prefecture Fisheries Management Division
  • Ishizaki Daisuke
    Shiga Prefectural Fisheries Experiment Station
  • Nemoto Morihito
    Shiga Prefectural Fisheries Experiment Station

Bibliographic Information

Other Title
  • 琵琶湖南湖におけるブルーギル生息量の年変動
  • ビワコ ナンコ ニ オケル ブルーギル セイソクリョウ ノ ネン ヘンドウ

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Abstract

Characteristics of the population dynamics of bluegill Lepomis macrochirus were studied in the south basin of Lake Biwa in 2009-2018. The bluegill CPUE in set nets during April to July fluctuated in the range of 1.9-30.2 kg/set net/day. According to multiple regression analysis, the largemouth bass (Micropterus salmoides) CPUE was detected as a negative factor, and the previous year’s water transparency reflecting the state of submerged macrophyte biomass was detected as a positive factor in relation to changes in bluegill CPUE. It was considered that the abundance of submerged macrophyte, which serve as hideouts for small bluegill, and the abundance of largemouth bass as predators were related to bluegill abundance. In addition, the size composition, and the nutritional condition of age-0 bluegill in the fall fluctuated annually, so it is necessary to clarify the relationship between the size and condition of the fish and overwinter mortality.

Journal

  • Aquaculture Science

    Aquaculture Science 68 (3), 243-251, 2020

    Japanese Society for Aquaculture Science

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