霞ケ浦における外来魚チャネルキャットフィッシュの季節的分布様式

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書誌事項

タイトル別名
  • Seasonal Distribution Patterns of the Alien Species, the Channel Catfish, Ictalurus punctatus, in Lake Kasumigaura, Ibaraki Prefecture, Japan
  • 霞ケ浦における外来魚チャネルキャットフィッシユの季節的分布様式
  • カスミガウラ ニ オケル ガイライギョ チャネル キャットフィッシュ ノ キセツテキ ブンプ ヨウシキ

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Seasonal changes in the distribution of the channel catfish, Ictalurus punctatus, in Lake Kasumigaura were examined from December 2003 to December 2004. Nighttime sampling was conducted in three depth zones using bottom gill nets: the shallow (1m depth, 50m offshore), intermediate (4-5m depth, 600m offshore) and deep (7-12m depth, 800m offshore) zones. Fish were caught at depths deeper than 4m from October to March, except in February, when the water temperature in the shallow zone was lower than 10°C. From April to November when the temperature of the shallow water was higher than 10°C, fish were collected from all zones and were abundant in the shallow zone from April to September, when the water temperature was higher than 21°C . Mature fish only occurred in the shallow zone from May to July, during their spawning season. These results indicated that the distribution pattern of channel catfish was related to water temperature, and that the fish aggregated the deep habitat during the cold season, when the water temperature was lower than 10°C, and dispersed to all the habitats in the warm season. Especially, mature fish migrated to the shallow zone to spawn.

収録刊行物

  • 水産増殖

    水産増殖 55 (4), 515-520, 2007

    日本水産増殖学会

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