Vulnerability of juvenile fish to piscivorous fish predators increases during nighttime in a seagrass bed in the central Seto Inland Sea, Japan

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  • 瀬戸内海中央部のアマモ場における稚魚に対する魚食性魚類による捕食圧は夜間に増大する

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Abstract

To test the hypothesis that vulnerability to predation of small-sized fishes increases during nighttime, the fish species composition, abundance, biomass and stomach contents of potential predators, and the mortality rate during tethering experiments were compared between daytime and nighttime at a seagrass bed in the central Seto Inland Sea, Japan. A total of 494 fishes belonging to 30 taxa were collected using a round seine on 28 and 30 August 2007. Abundance and biomass of potential fish predators (piscivorous fish >82.5mm in total length) were higher in nighttime than in daytime. Sebastes cheni juveniles and Rudaris ercodes were predated on by Sebastes inermis and Lateolabrax japonicus. Predation rate of juvenile S. cheni, a dominant species in the fish community, estimated from the ratio of the number of juveniles predated to that of population (sum of surviving and predated juveniles) during nighttime (1930-2100h) was 5.1%. Tethering experiments for 6h at the seagrass bed indicated that the mortality rate of juvenile S. cheni in nighttime was significantly higher than that in daytime. It is plausible that seagrass beds contribute as foraging habitats for piscivorous fish during nighttime although they are important nurseries for a variety of fish species.

Journal

  • 水産海洋研究

    水産海洋研究 76 (1), 24-29, 2012-02

    東京 : 水産海洋学会

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