Bycatch as a potential threat to harbour porpoises ( Phocoena phocoena ) in Polish Baltic waters
Sixty-two verified reports obtained in the years 1990-1999 on the bycatch, strandings and sightings of harbour porpoises in the Polish Baltic were analysed in this study. In relative terms the highest number of reports (22) was noted in Puck Bay. Forty-five (72.6%) reports referred to specimens from...
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Septentrio Academic Publishing
2003
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ftdoajarticles:oai:doaj.org/article:d2cb8225d7dd46dd9aaeea2e1d138011 2023-05-15T16:33:29+02:00 Bycatch as a potential threat to harbour porpoises ( Phocoena phocoena ) in Polish Baltic waters Krzysztof E Skóra Iwona Kuklik 2003-07-01T00:00:00Z https://doi.org/10.7557/3.2831 https://doaj.org/article/d2cb8225d7dd46dd9aaeea2e1d138011 EN eng Septentrio Academic Publishing https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2831 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2831 https://doaj.org/article/d2cb8225d7dd46dd9aaeea2e1d138011 NAMMCO Scientific Publications, Vol 5, Iss 0, Pp 303-315 (2003) harbour porpoise bycatch Poland Ecology QH540-549.5 article 2003 ftdoajarticles https://doi.org/10.7557/3.2831 2022-12-31T05:55:36Z Sixty-two verified reports obtained in the years 1990-1999 on the bycatch, strandings and sightings of harbour porpoises in the Polish Baltic were analysed in this study. In relative terms the highest number of reports (22) was noted in Puck Bay. Forty-five (72.6%) reports referred to specimens from bycatch, 10 (16.1%) were individuals observed at sea, and 7 (11.3%) were stranded. A large proportion (42.2%) of the bycatch occurred in the fishing grounds of Puck Bay. Forty carcasses of harbour porpoises were obtained for further analysis. Most of the bycatch took place from December to April with a maximum in March. In the rest of the year there were 1 to 3 bycaught animals reported per month with no cases of bycatch in June. Taking into account data on fishing effort collected for the study area it appears that by far the greatest threat to harbour porpoises is posed by nets used for salmonids. Among all the bycaught animals, most (40.0%) perished in salmon semi-drift nets. A considerable number of the harbour porpoises perished in bottom set nets for cod (33.3%) while only a single bycatch event was reported from herring trawl nets. To assess the danger from different fishing gear and to determine the areas where the threats are the highest, direct observation of the fisheries was conducted. In the course of boat inspections various types of fishing gear were identified and geographical positions of 1,069 nets were marked. The majority (92%) consisted of semi-drift nets for sea trout and salmon. Relatively low rates of bycatch were reported from bottom set nets, which had a density over 20 times less than that of surface salmon nets in the area in the autumn months. The density and distribution of both types of nets in the surveyed area was comparable during autumn and winter, when the majority of bycaught animals in bottom set nets were reported. Article in Journal/Newspaper Harbour porpoise Phocoena phocoena Directory of Open Access Journals: DOAJ Articles NAMMCO Scientific Publications 5 303 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
harbour porpoise bycatch Poland Ecology QH540-549.5 |
spellingShingle |
harbour porpoise bycatch Poland Ecology QH540-549.5 Krzysztof E Skóra Iwona Kuklik Bycatch as a potential threat to harbour porpoises ( Phocoena phocoena ) in Polish Baltic waters |
topic_facet |
harbour porpoise bycatch Poland Ecology QH540-549.5 |
description |
Sixty-two verified reports obtained in the years 1990-1999 on the bycatch, strandings and sightings of harbour porpoises in the Polish Baltic were analysed in this study. In relative terms the highest number of reports (22) was noted in Puck Bay. Forty-five (72.6%) reports referred to specimens from bycatch, 10 (16.1%) were individuals observed at sea, and 7 (11.3%) were stranded. A large proportion (42.2%) of the bycatch occurred in the fishing grounds of Puck Bay. Forty carcasses of harbour porpoises were obtained for further analysis. Most of the bycatch took place from December to April with a maximum in March. In the rest of the year there were 1 to 3 bycaught animals reported per month with no cases of bycatch in June. Taking into account data on fishing effort collected for the study area it appears that by far the greatest threat to harbour porpoises is posed by nets used for salmonids. Among all the bycaught animals, most (40.0%) perished in salmon semi-drift nets. A considerable number of the harbour porpoises perished in bottom set nets for cod (33.3%) while only a single bycatch event was reported from herring trawl nets. To assess the danger from different fishing gear and to determine the areas where the threats are the highest, direct observation of the fisheries was conducted. In the course of boat inspections various types of fishing gear were identified and geographical positions of 1,069 nets were marked. The majority (92%) consisted of semi-drift nets for sea trout and salmon. Relatively low rates of bycatch were reported from bottom set nets, which had a density over 20 times less than that of surface salmon nets in the area in the autumn months. The density and distribution of both types of nets in the surveyed area was comparable during autumn and winter, when the majority of bycaught animals in bottom set nets were reported. |
format |
Article in Journal/Newspaper |
author |
Krzysztof E Skóra Iwona Kuklik |
author_facet |
Krzysztof E Skóra Iwona Kuklik |
author_sort |
Krzysztof E Skóra |
title |
Bycatch as a potential threat to harbour porpoises ( Phocoena phocoena ) in Polish Baltic waters |
title_short |
Bycatch as a potential threat to harbour porpoises ( Phocoena phocoena ) in Polish Baltic waters |
title_full |
Bycatch as a potential threat to harbour porpoises ( Phocoena phocoena ) in Polish Baltic waters |
title_fullStr |
Bycatch as a potential threat to harbour porpoises ( Phocoena phocoena ) in Polish Baltic waters |
title_full_unstemmed |
Bycatch as a potential threat to harbour porpoises ( Phocoena phocoena ) in Polish Baltic waters |
title_sort |
bycatch as a potential threat to harbour porpoises ( phocoena phocoena ) in polish baltic waters |
publisher |
Septentrio Academic Publishing |
publishDate |
2003 |
url |
https://doi.org/10.7557/3.2831 https://doaj.org/article/d2cb8225d7dd46dd9aaeea2e1d138011 |
genre |
Harbour porpoise Phocoena phocoena |
genre_facet |
Harbour porpoise Phocoena phocoena |
op_source |
NAMMCO Scientific Publications, Vol 5, Iss 0, Pp 303-315 (2003) |
op_relation |
https://septentrio.uit.no/index.php/NAMMCOSP/article/view/2831 https://doaj.org/toc/1560-2206 https://doaj.org/toc/2309-2491 1560-2206 2309-2491 doi:10.7557/3.2831 https://doaj.org/article/d2cb8225d7dd46dd9aaeea2e1d138011 |
op_doi |
https://doi.org/10.7557/3.2831 |
container_title |
NAMMCO Scientific Publications |
container_volume |
5 |
container_start_page |
303 |
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1766023167357222912 |