Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Observation of Juvenile Southern Bluefin Tuna (Thunnus maccoyi C.) School Response to the Approaching Vessel Using Scanning Sonar

  • Lee Yoo-Won (Department of Marine Production System Engineering, Pukyong National University) ;
  • Miyashita Kazushi (Laboratory of Training Ship, Faculty of Fisheries, Hokkaido University) ;
  • Nishida Tsutomu (National Research Institute of Far Seas Fisheries) ;
  • Harada Sei-Ichiro (Japan Marine Fishery Resources Research Center) ;
  • Mukai Tohru (Laboratory of Marine Environment and Resource Sensing, Graduate School of Fisheries Sciences, Hokkaido University) ;
  • Iida Kohji (Laboratory of Marine Environment and Resource Sensing, Graduate School of Fisheries Sciences, Hokkaido University)
  • Published : 2002.09.01
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Abstract

The aim of this study was to obtain the basic data on the fish school behavior change to approaching vessel and fish species identification by means of their swimming speed. The surveys were carried out for the juvenile southern blue fin tuna and other fish schools off Esperance, western Australia from January to March 1999. We observed changes of fish school behavior in response to the approaching vessel using 360-degree scanning sonar. The results showed that, a horizontal direction index used to quantify a change of fish school behavior did not identify dependence of a radial distance and a swimming speed. A Mann­Whitney test conducted using the horizontal swimming speed of both species identified by sonar specialists, did not reveal a significant difference.

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References

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