Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Swimming Characteristics of the Black Porgy Acanthopagrus schlegeli in the Towing Cod-End of a Trawl

  • Kim Yong-Hae (Institute of Marine Industry & Department of Marine Production, College of Marine Science, Gyeongsang National University) ;
  • Jang Chi Yeong (Institute of Marine Industry & Department of Marine Production, College of Marine Science, Gyeongsang National University)
  • Published : 2005.09.01
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Abstract

Fishing selectivity is determined by the level of voluntary escaping behavior in accordance with decision-making based on the relationship between fish size and mesh size. This study examined movement during the swimming behavior of black porgy in a trawl's towing cod-end and analyzed the movement components such as swimming speed, angular velocity of turning, and distance to the net over time. Most of the observed fish exhibited an optomotor response, maintaining position and swimming speed without changing direction. Others exhibited erratic or 'panic' behavior with sudden changes in swimming speed and direction. The latter behavior involved very irregular and aperiodic variations in swimming speed and angular velocity, termed 'chaotic behavior.' Thus, the results of this study can be applied to a chaotic behavior model as a time series of swimming movements in the towing cod-end for the fishing selectivity.

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References

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