Comparison of monitoring methods for reed belt ichthyofauna in a eutrophic lake, central Honshu, Japan

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  • Kanou Kouki
    茨城大学広域水圏環境科学教育研究センター
  • Usui Seiji
    東京大学大学院農学生命科学研究科生圏システム学専攻
  • Kawashima Yuta
    千葉大学教育学部理科教育講座
  • Yokoi Ken-ichi
    特定非営利活動法人日本国際湿地保全連合

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  • 富栄養湖のヨシ帯における魚類相のモニタリング方法の比較
  • フ エイヨウコ ノ ヨシタイ ニ オケル ギョルイソウ ノ モニタリング ホウホウ ノ ヒカク

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Abstract

<p>Reed belts in temperate lakes support large numbers of fishes and provide nurseries for many species, including some of endangered status or commercial importance. Although monitoring of such assemblages is important for ecological and fisheries assessments in many lakes in Japan, little information exists on appropriate sampling gear for a better representation of fish species richness and composition in reed belts. An evaluation of comparative efficiencies of different sampling methods for monitoring fish assemblages, based on six commonly used gear types [electrofishing (EF), minnow trap (MT), hand net (HN), casting net (CN), seine net (SN) and fyke net (FN)], was conducted in lentic reed belts in a eutrophic lake, Kitaura, Ibaraki Prefecture, central Japan, in June and August 2015. A total of 3,060 individuals, representing 11 families and 26 species, were collected during the study period. The mean number of species per replicate was significantly greater for FN, SN and CN than EF, MT and HN in each month. More than 96% of the total species recorded throughout the study period were collected by a combination of FN and CN. Furthermore, the species composition of the assemblages sampled by FN, SN and CN differed from that by EF, MT and HN, due to the low catch efficiency of the latter. These results suggested that use of multiple gear types, including FN and CN, represents a more efficient method for monitoring lentic reed belt ichthyofauna.</p>

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