Predation by scavenging amphipods to injured hatchery-raised juvenile Japanese flounder Paralichthys olivaceus under laboratory conditions

Keiichiro Ide, Kazutaka Takahashi, Koichi Sasaki, Michio Omori

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    The attacking potential of the scavenging amphipod Scopelocheirus onagawae on artificially injured hatchery-raised Japanese flounder Paralichthys olivaceus juveniles was investigated in relation to the degree of injury on the fish. All injured flounder juveniles were attacked by amphipods regardless of the degree of injury, while non-injured juveniles were not attacked. The attack by amphipods on the juveniles generally depended on the amount of glycine, a main feeding stimulant for the amphipod, released from the injury opening. The swimming ability of flounder juveniles was important to avoid the attack of amphipods. Furthermore, an area of injury allowing the amphipods to cling to the fish affects to the vulnerability of juveniles against the predation of amphipods. This study suggests that scavenging amphipods are potentially involved in the rapid reduction of the number of hatchery-raised juveniles.

    Original languageEnglish
    Pages (from-to)1209-1214
    Number of pages6
    JournalFisheries Science
    Volume72
    Issue number6
    DOIs
    Publication statusPublished - 2006 Dec

    Keywords

    • Attack
    • Glycine
    • Hatchery-raised
    • Injury
    • Japanese flounder
    • Lysianassid
    • Scopelocheirus onagawae
    • Stock-enhancement

    ASJC Scopus subject areas

    • Aquatic Science

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