False killer whale (Pseudorca crassidens) echolocation and acoustic disruption: implications for longline bycatch and depredation

Authors: 

Mooney, T.A. A.F. Pacini and P.E. Nachtigall

Year: 

2009

Journal/Publisher Name: 

Canadian Journal of Zoology

Volume (Issue #): 

87

Page #s: 

726-733

Contact information: 

amooney@whoi.edu
Summary: 

An acoustic device designed to deter false killer whales from approaching longlines by reducing the whales' echolocation performance capabilities was tested on a trained false killer whale. The device, Longline Saver, produced a series of complex, broadband signals (1-250 kHz) at high intensity levels (up to 182 dB). The whale was asked to detect a target in the presense or abscence of the acoustic device. Initially, the device reduced the whale's echolocation performace to chance levels, however subsequent trials demonstrated improvement in echolocation.