Synthetic harbour porpoise (Phocoena phocoena) communication signals emitted by acoustic alerting device (Porpoise ALert, PAL) significantly reduce their bycatch in western Baltic gillnet fisheries
Gillnet fisheries are one of the main anthropogenic causes of harbour porpoise (Phocoena phocoena L., 1758) mortality in the Baltic Sea. A new kind of acoustic alerting device (Porpoise ALert, PAL) was tested in commercial gillnet fisheries in the western Baltic. PAL emits 133 kHz synthetic harbour...
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ftopenagrar:oai:www.openagrar.de:openagrar_mods_00065221 2024-09-15T18:10:41+00:00 Synthetic harbour porpoise (Phocoena phocoena) communication signals emitted by acoustic alerting device (Porpoise ALert, PAL) significantly reduce their bycatch in western Baltic gillnet fisheries Chladek, Jerome-Christoph Culik, Boris M. Kindt-Larsen, Lotte Moesgaard Albertsen, Christoffer Dorrien, Christian von 2020 https://doi.org/10.1016/j.fishres.2020.105732 https://www.openagrar.de/receive/openagrar_mods_00065221 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00034249/dn062965.pdf eng eng Fisheries research : an international journal on fisheries science, fishing technology and fisheries management -- FISH RES (AMST) -- 0165-7836 -- 1497860-x -- 406532-3 -- http://www.bibliothek.uni-regensburg.de/ezeit/?1497860 -- http://www.sciencedirect.com/science/journal/01657836 https://doi.org/10.1016/j.fishres.2020.105732 https://www.openagrar.de/receive/openagrar_mods_00065221 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00034249/dn062965.pdf only signed in user all rights reserved info:eu-repo/semantics/restrictedAccess Text article ddc:570 Harbour porpoise -- Bycatch mitigation -- Marine mammals -- Gillnet fisheries -- Pinger -- Acoustics article Text doc-type:article 2020 ftopenagrar https://doi.org/10.1016/j.fishres.2020.105732 2024-07-08T23:56:25Z Gillnet fisheries are one of the main anthropogenic causes of harbour porpoise (Phocoena phocoena L., 1758) mortality in the Baltic Sea. A new kind of acoustic alerting device (Porpoise ALert, PAL) was tested in commercial gillnet fisheries in the western Baltic. PAL emits 133 kHz synthetic harbour porpoise communication signals, unlike conventional acoustic deterrent devices (pingers), which emit artificial noise. Trials were undertaken by three commercial gillnet vessels conducting 778 trips during standard fishing operations from 2014 to 2016. In all, 1120 PAL-equipped net strings were tested against 1529 simultaneously set control strings with no devices. We tested two versions of the PAL (v1 and v2) consecutively. These were spaced <=210 m apart on the gillnet floatlines, with all devices pointing in the same direction to ensure complete acoustic coverage of the strings. Two vessels fished in Kiel Bight and around Fehmarn Island in German waters, and the third vessel fished in the Øresund, in inner Danish waters. Overall, 18 harbour porpoises were bycaught in control strings (mean 0.01 ± 0.1/haul), and five harbour porpoises were taken as bycatch in strings equipped with PALs (0.004 ± 0.07/haul). The number of net string bycatches was analysed using a generalised linear mixed model (GLMM). The model applied to all observations revealed that the expected bycatch was significantly influenced by PAL deployment (p < 0.05), decreasing the expected bycatch by 64.9 % (95 % confidence interval (CI): 8.7–88.7 %). PAL effectiveness was also increased by reducing device spacing to <=200 m (16 bycatches in control, three in PAL strings; mean bycatch reduction 79.7 %). Additional model cases were applied to the data and are discussed. We conclude that, with this specific communication signal, PAL can significantly reduce harbour porpoise bycatch in gillnets deployed in the western Baltic Sea, thus reconciling anthropogenic activities with protection of the marine environment. Article in Journal/Newspaper Harbour porpoise Phocoena phocoena OpenAgrar (OA) Fisheries Research 232 105732 |
institution |
Open Polar |
collection |
OpenAgrar (OA) |
op_collection_id |
ftopenagrar |
language |
English |
topic |
Text article ddc:570 Harbour porpoise -- Bycatch mitigation -- Marine mammals -- Gillnet fisheries -- Pinger -- Acoustics |
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Text article ddc:570 Harbour porpoise -- Bycatch mitigation -- Marine mammals -- Gillnet fisheries -- Pinger -- Acoustics Chladek, Jerome-Christoph Culik, Boris M. Kindt-Larsen, Lotte Moesgaard Albertsen, Christoffer Dorrien, Christian von Synthetic harbour porpoise (Phocoena phocoena) communication signals emitted by acoustic alerting device (Porpoise ALert, PAL) significantly reduce their bycatch in western Baltic gillnet fisheries |
topic_facet |
Text article ddc:570 Harbour porpoise -- Bycatch mitigation -- Marine mammals -- Gillnet fisheries -- Pinger -- Acoustics |
description |
Gillnet fisheries are one of the main anthropogenic causes of harbour porpoise (Phocoena phocoena L., 1758) mortality in the Baltic Sea. A new kind of acoustic alerting device (Porpoise ALert, PAL) was tested in commercial gillnet fisheries in the western Baltic. PAL emits 133 kHz synthetic harbour porpoise communication signals, unlike conventional acoustic deterrent devices (pingers), which emit artificial noise. Trials were undertaken by three commercial gillnet vessels conducting 778 trips during standard fishing operations from 2014 to 2016. In all, 1120 PAL-equipped net strings were tested against 1529 simultaneously set control strings with no devices. We tested two versions of the PAL (v1 and v2) consecutively. These were spaced <=210 m apart on the gillnet floatlines, with all devices pointing in the same direction to ensure complete acoustic coverage of the strings. Two vessels fished in Kiel Bight and around Fehmarn Island in German waters, and the third vessel fished in the Øresund, in inner Danish waters. Overall, 18 harbour porpoises were bycaught in control strings (mean 0.01 ± 0.1/haul), and five harbour porpoises were taken as bycatch in strings equipped with PALs (0.004 ± 0.07/haul). The number of net string bycatches was analysed using a generalised linear mixed model (GLMM). The model applied to all observations revealed that the expected bycatch was significantly influenced by PAL deployment (p < 0.05), decreasing the expected bycatch by 64.9 % (95 % confidence interval (CI): 8.7–88.7 %). PAL effectiveness was also increased by reducing device spacing to <=200 m (16 bycatches in control, three in PAL strings; mean bycatch reduction 79.7 %). Additional model cases were applied to the data and are discussed. We conclude that, with this specific communication signal, PAL can significantly reduce harbour porpoise bycatch in gillnets deployed in the western Baltic Sea, thus reconciling anthropogenic activities with protection of the marine environment. |
format |
Article in Journal/Newspaper |
author |
Chladek, Jerome-Christoph Culik, Boris M. Kindt-Larsen, Lotte Moesgaard Albertsen, Christoffer Dorrien, Christian von |
author_facet |
Chladek, Jerome-Christoph Culik, Boris M. Kindt-Larsen, Lotte Moesgaard Albertsen, Christoffer Dorrien, Christian von |
author_sort |
Chladek, Jerome-Christoph |
title |
Synthetic harbour porpoise (Phocoena phocoena) communication signals emitted by acoustic alerting device (Porpoise ALert, PAL) significantly reduce their bycatch in western Baltic gillnet fisheries |
title_short |
Synthetic harbour porpoise (Phocoena phocoena) communication signals emitted by acoustic alerting device (Porpoise ALert, PAL) significantly reduce their bycatch in western Baltic gillnet fisheries |
title_full |
Synthetic harbour porpoise (Phocoena phocoena) communication signals emitted by acoustic alerting device (Porpoise ALert, PAL) significantly reduce their bycatch in western Baltic gillnet fisheries |
title_fullStr |
Synthetic harbour porpoise (Phocoena phocoena) communication signals emitted by acoustic alerting device (Porpoise ALert, PAL) significantly reduce their bycatch in western Baltic gillnet fisheries |
title_full_unstemmed |
Synthetic harbour porpoise (Phocoena phocoena) communication signals emitted by acoustic alerting device (Porpoise ALert, PAL) significantly reduce their bycatch in western Baltic gillnet fisheries |
title_sort |
synthetic harbour porpoise (phocoena phocoena) communication signals emitted by acoustic alerting device (porpoise alert, pal) significantly reduce their bycatch in western baltic gillnet fisheries |
publishDate |
2020 |
url |
https://doi.org/10.1016/j.fishres.2020.105732 https://www.openagrar.de/receive/openagrar_mods_00065221 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00034249/dn062965.pdf |
genre |
Harbour porpoise Phocoena phocoena |
genre_facet |
Harbour porpoise Phocoena phocoena |
op_relation |
Fisheries research : an international journal on fisheries science, fishing technology and fisheries management -- FISH RES (AMST) -- 0165-7836 -- 1497860-x -- 406532-3 -- http://www.bibliothek.uni-regensburg.de/ezeit/?1497860 -- http://www.sciencedirect.com/science/journal/01657836 https://doi.org/10.1016/j.fishres.2020.105732 https://www.openagrar.de/receive/openagrar_mods_00065221 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00034249/dn062965.pdf |
op_rights |
only signed in user all rights reserved info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.fishres.2020.105732 |
container_title |
Fisheries Research |
container_volume |
232 |
container_start_page |
105732 |
_version_ |
1810448273856528384 |