University Of Tasmania
Browse
J. Semmens Huveneers_et_al_2013.pdf (864.93 kB)

Effects of an Electric Field on White Sharks: In Situ Testing of an Electric Deterrent

Download (864.93 kB)
journal contribution
posted on 2023-05-17, 22:21 authored by Huveneers, C, Rogers, PJ, Jayson SemmensJayson Semmens, Beckmann, C, Kock, AA, Page, B, Goldsworthy, SD
Elasmobranchs can detect minute electromagnetic fields, <1 nVcmā€“1, using their ampullae of Lorenzini. Behavioural responses to electric fields have been investigated in various species, sometimes with the aim to develop shark deterrents to improve human safety. The present study tested the effects of the Shark Shield Freedom7ā„¢ electric deterrent on (1) the behaviour of 18 white sharks (Carcharodon carcharias) near a static bait, and (2) the rates of attacks on a towed seal decoy. In the first experiment, 116 trials using a static bait were performed at the Neptune Islands, South Australia. The proportion of baits taken during static bait trials was not affected by the electric field. The electric field, however, increased the time it took them to consume the bait, the number of interactions per approach, and decreased the proportion of interactions within two metres of the field source. The effect of the electric field was not uniform across all sharks. In the second experiment, 189 tows using a seal decoy were conducted near Seal Island, South Africa. No breaches and only two surface interactions were observed during the tows when the electric field was activated, compared with 16 breaches and 27 surface interactions without the electric field. The present study suggests that the behavioural response of white sharks and the level of risk reduction resulting from the electric field is contextually specific, and depends on the motivational state of sharks.

History

Publication title

Plos One

Volume

8

Issue

5

Article number

e62730

Number

e62730

Pagination

1-11

ISSN

1932-6203

Department/School

Institute for Marine and Antarctic Studies

Publisher

Public Library of Science

Place of publication

United States

Rights statement

Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

Repository Status

  • Open

Socio-economic Objectives

Assessment and management of terrestrial ecosystems

Usage metrics

    University Of Tasmania

    Exports