Skip Navigation

ICES Journal of Marine Science: Journal du Conseil 2006 63(9):1751-1758; doi:10.1016/j.icesjms.2006.06.015
This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF) Freely available
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Fjälling, A.
Right arrow Articles by Westerberg, H.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Fjälling, A.
Right arrow Articles by Westerberg, H.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© 2006 International Council for the Exploration of the Sea

Acoustic harassment devices reduce seal interaction in the Baltic salmon-trap, net fishery

Arne Fjällinga,*, Magnus Wahlbergb and Håkan Westerbergc

a National Board of Fisheries SE-178 93 Drottningholm, Sweden
b University of Aarhus, Department of Zoophysiology C. F. Moellers Allé Building 131, DK-8000 Aarhus C, Denmark
c National Board of Fisheries Box 423, SE-401 26 Gothenburg, Sweden

*Correspondence to A. Fjälling: tel: +46 8 6990622; fax: +46 8 6990650. e-mail: arne.fjalling{at}fiskeriverket.se.

Acoustic harassment devices (AHDs) were deployed at salmon-trap nets in the Baltic Sea to reduce gear and catch damage by grey seals (Halichoerus grypus). The AHDs emitted pulses of 250–500-ms duration, worked at a frequency of 15 kHz, and a source level of 179 dB re 1 µPa rms at 1 m. AHDs were deployed during three consecutive fishing seasons. Catches were significantly higher in traps with AHDs (25.5 kg d–1) than in controls (12.0 kg d–1), and catch damage was less (3.5 vs. 6.7 kg d–1). These results persisted over and between fishing seasons, but late in the season damage to the catches was common also in traps with AHDs. This study shows that the AHD may be a complementary mitigation tool in the seal–fishery conflict in certain types of fisheries, even though it is technically demanding, and for environmental reasons should be used with great care.

Keywords: conflict, damage, fishery, grey seals, mitigation, salmon

Received 18 December 2005; accepted 28 June 2006.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 ICES J. Mar. Sci.Home page
J. Vilata, D. Oliva, and M. Sepulveda
The predation of farmed salmon by South American sea lions (Otaria flavescens) in southern Chile
ICES J. Mar. Sci., November 6, 2009; (2009) fsp250v1.
[Abstract] [Full Text] [PDF]

Home page
 ICES J. Mar. Sci.Home page
I. M. Graham, R. N. Harris, B. Denny, D. Fowden, and D. Pullan
Testing the effectiveness of an acoustic deterrent device for excluding seals from Atlantic salmon rivers in Scotland
ICES J. Mar. Sci., June 1, 2009; 66(5): 860 - 864.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.