Prey selectivity of two cyprinid fishes in Ogochi Reservoir.

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  • Urabe Jotarou
    Department of Biology, Faculty of Science, Tokyo Metropolitan University
  • Maruyama Takashi
    Research Laboratory of Fisheries Resources, Tokyo University of Fisheries

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Other Title
  • 小河内貯水池におけるコイ科魚類2種の摂餌選択性
  • 小河内貯水池におけるコイ科魚類2種の摂餌選択性〔英文〕
  • オゴウチ チョスイチ ニ オケル コイカ ギョルイ 2シュ ノ セツジ

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Description

In order to evaluate the predational impact on various zooplankton species, gut contents were examined on two dominant cyprinid fishes, Honmoroko Gnathopogon elongatus caerulescens and Oikawa Zacco platypus, in Ogochi Reservoir through warm water season. Crustacean plankton is usually dominant in the gut contents of both fishes and one of the largest crustacean prey species Daphnia galeata is exclusively dominant when this species is abundant. When Daphnia is scarce, Honmoroko preys mainly on other crustacean plankton such as copepodids of Cyclopidae and Diaphanosoma, but total ingestion is relatively low regardless of the abundance of these crustacean plankton. On the other hand, Oikawa preys mainly on terrestrial insects. The amount of in-gestion for some other zooplankton species such as rotifers, Bosmina and Bosminopsis is con-siderably small in both fish species. These results suggest that the most vulnerable zooplankton to fish predation is Daphnia in this reservoir and other zooplankton may have more chance to coexist with Honmoroko and Oikawa because of the small size or escape ability.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 52 (12), 2045-2054, 1986

    The Japanese Society of Fisheries Science

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