International Council for the Exploration of the Sea
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Acoustic Harassment Devices (AHD) for salmon trap nets in the Baltic Sea

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conference contribution
posted on 2024-03-22, 10:55 authored by Arne Fjälling, Magnus Wahlberg, Håkan Westerberg

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Many attempts have been made to use sound to reduce the conflict between mammals and human activities in the marine environment. AHD-s (Acoustic Harassment Devices) produce a sound intense enough to cause discomfort and avoidance and are used extensively in aquaculture. Some trials have also been made in fisheries operations (Mate and Harvey 1986, Jefferson and Curry 1996) with the aim of avoiding by-catch of marine mammals and of stopping damage to gear and catch. Generally, limited quantitative data have been presented on the long term mitigating effect of AHD-s. In order to obtain such data, a series of field trials were carried out at set traps for salmonids in the northern part of the Baltic Sea. This fishery is subject to heavy disturbance by grey seals (Westerberg et al. 2000, Fjälling 2005), and mitigation methods are under development (Lunneryd et al. 2003).



2005 ICES Annual Science Conference, Aberdeen, Scotland


Theme Session X on Mitigation Methods for Reduction of Marine Mammal and Sea Turtle By-catch in Fisheries

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[Authors]. 2005. Acoustic Harassment Devices (AHD) for salmon trap nets in the Baltic Sea. 2005 ICES Annual Science Conference, Aberdeen, Scotland. CM 2005/X:16.

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