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Studies on Echolocation of Porpoises Taken in Salmon Gillnet Fisheries

  • Yoshimi Hatakeyama
  • Hideo Soeda
Part of the NATO ASI Series book series (NSSA, volume 196)

Abstract

In the Bering Sea, marine mammals, particularly Dall’s porpoises, Phocoenoides dalli, get incidentally entangled in gillnets of the Japanese mothership salmon fishery. The maximum total number of Dall’s porpoises to be caught in a year was fixed by U.S. law. In order to develop techniques and devices to reduce the incidental catch in the gillnets, it is necessary to learn why and how they get entangled.

Keywords

Swimming Speed Target Strength Harbor Porpoise Source Level Auditory Threshold 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Yoshimi Hatakeyama
    • 1
  • Hideo Soeda
    • 1
    • 2
  1. 1.National Research Institute of Fisheries EngineeringTokyo, 104Japan
  2. 2.College of Agriculture and Veterinary MedicineNihon UniversityTokyo, 154Japan

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