A new device for monitoring the activity of freely swimming flatfish, Japanese flounder Paralichthys olivaceus.

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  • KAWABE RYO
    Laboratory of Fishing Production System, Graduate School of Fisheries Sciences, Hokkaido University
  • NASHIMOTO KATSUAKI
    Laboratory of Fishing Production System, Graduate School of Fisheries Sciences, Hokkaido University
  • HIRAISHI TOMONORI
    Laboratory of Fishing Production System, Graduate School of Fisheries Sciences, Hokkaido University
  • NAITO YASUHIKO
    National Institute of Polar Research
  • SATO KATSUFUMI
    National Institute of Polar Research

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  • new device for monitoring the activity of freely swimming flatfish Japanese flounder Paralichthys olivaceus
  • A new device for monitoring the activity of freely swimming flatfish, Japanese ounder <italic>Paralichthys olivaceus</italic>

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Description

The tail beat and activity behavior of four captive Japanese flounder Paralichthys olivaceus, were monitored with acceleration data-loggers while the fish swam in an aquarium. Depth, swimming speeds and two-axis acceleration data were collected continuously for approximately 20 h per fish. Simultaneously, the swimming behaviors of the fish were filmed at different angles. Using the specific characteristic of the acceleration profiles, in tandem with other types of data (e.g. speed and depth), four behavioral patterns could be distinguished: (i) ‘active’ swimming; (ii) burying patterns; (iii) ‘inactive’ gliding; and (iv) lying on the bottom. Tail beat frequency ranged from 1.65±0.47 to 2.04±0.25 Hz (mean±SD; n=4). Using the relationship between tail beat frequency and swimming speed, the ‘preferred’ swimming speed of the fish was estimated to be between 0.6 and 1.2 body lengths (BL)/s. Additionally, fish rarely swam faster than 1.2 BL/s. This study shows that the acceleration data-loggers represent a useful and reliable system for accurately recording the tail beat of free-ranging fish and estimating flatfish behavior.

Journal

  • Fisheries science

    Fisheries science 69 (1), 3-10, 2003

    The Japanese Society of Fisheries Science

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