Simultaneous measurement of swimming speed and tail beat activity of free-swimming rainbow trout Oncorhynchus mykiss using an acceleration data-logger

Authors

  • Ryo KAWABE,

    Corresponding author
    1. Laboratory of Marine Ecosystem Change Analysis, Field Science Center for the Northern Biosphere,
      *Tel: 81-138-40-8856.
      Fax: 81-138-40-8856. Email: kawabe@fish.hokudai.ac.jp
    Search for more papers by this author
  • Takafumi KAWANO,

    1. Laboratory of Fishing Production System, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 and
    Search for more papers by this author
    • a

      Tokyo Visual Arts College, Chiyoda, Tokyo 102-0081, Japan.

  • Norihiko NAKANO,

    1. Laboratory of Fishing Production System, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 and
    Search for more papers by this author
  • Nariharu YAMASHITA,

    1. Laboratory of Fishing Production System, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 and
    Search for more papers by this author
  • Tomonori HIRAISHI,

    1. Laboratory of Fishing Production System, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 and
    Search for more papers by this author
  • Yasuhiko NAITO

    1. National Institute of Polar Research, Itabashi, Tokyo 173-8515, Japan
    Search for more papers by this author

*Tel: 81-138-40-8856.
Fax: 81-138-40-8856. Email: kawabe@fish.hokudai.ac.jp

Abstract

ABSTRACT:  A recently developed motion detector (acceleration data-logger), based on acceleration measurements, was used to monitor the swimming behavior of two free-swimming captive rainbow trout Oncorhynchus mykiss in an aquaculture net cage. Depth, swimming speeds and two-direction acceleration data were collected continuously for approximately 20 h per fish. To define relationships between swaying acceleration profiles and tail beat activity of rainbow trout, the tail beat activity of trout was monitored using a video camera in a small tank with the simultaneous use of the acceleration data-logger. During steady swimming, there were sharp, distinct peaks of swaying acceleration. When compared with the data from the video camera, the frequency of swaying acceleration was synchronized with the sequences of swimming activity. In addition, the tail beat frequency of the fish could be identified within the cycle of swaying acceleration during steady swimming phases. Mean tail beat frequency was 1.27 ± 0.40 and 1.40 ± 0.5 Hz (mean ± SD). Using the relationship between tail beat frequency and swimming speed, the ‘preferred’ swimming speed of trout was estimated to be between 0.48 and 0.58 body length (BL)/s, and trout rarely swam in excess of 2.0 BL/s. The present study shows that acceleration data-loggers used to record spontaneous measurements of swimming speed and tail beat activity represent a useful and reliable system for accurately estimating both the rate of activities and movements of free-ranging fish.

Ancillary