Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008
This is the first study estimating cetacean by-catch in the Turkish western Black Sea turbot fishery. One turbot fishing boat was observed during two fishing seasons, from April through July 2007 and April through mid-September 2008. During this time, 24 harbour porpoises and one bottlenose dolphin...
Published in: | Journal of the Marine Biological Association of the United Kingdom |
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Online Access: | https://hdl.handle.net/20.500.12627/149377 https://doi.org/10.1017/s0025315416000060 |
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ftistanbuluniv:oai:http://acikerisim.istanbul.edu.tr:20.500.12627/149377 2023-05-15T16:33:18+02:00 Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008 Tonay, Arda M. İstanbul Üniversitesi , Su Ürünleri Fakültesi , Temel Bilimler 74372 2016 https://hdl.handle.net/20.500.12627/149377 https://doi.org/10.1017/s0025315416000060 eng eng JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM Tonay A. M. , "Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008", JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM, cilt.96, ss.993-998, 2016 0025-3154 av_e2fb0f17-32f9-492e-9c05-d390c6a9d1db vv_1032021 http://hdl.handle.net/20.500.12627/149377 https://doi.org/10.1017/s0025315416000060 96 4 993 998 DENİZ VE TATLISU BİYOLOJİSİ Su Hasadı Toprak ve Su Muhafazası ve Amenajmanı Toprak ve Bitki Besleme Ziraat Tarımsal Bilimler Tarım ve Çevre Bilimleri (AGE) Bitki ve Hayvan Bilimleri Makale 2016 ftistanbuluniv https://doi.org/20.500.12627/149377 https://doi.org/10.1017/s0025315416000060 2022-08-10T13:00:35Z This is the first study estimating cetacean by-catch in the Turkish western Black Sea turbot fishery. One turbot fishing boat was observed during two fishing seasons, from April through July 2007 and April through mid-September 2008. During this time, 24 harbour porpoises and one bottlenose dolphin were caught in turbot trammel nets. The by-catch rate was found to be 0.18 for harbour porpoise and 0.01 for bottlenose dolphin individuals per kilometre in 2007, and 0.19 for harbour porpoise individuals in 2008. It is estimated that the total numbers of harbour porpoises killed in the Turkish western Black Sea during the legal fishing period (April and July) were 167 +/- 153 (CV: 0.92) in 2007 and 329 +/- 220 (CV: 0.67) in 2008, and the number killed during both legal and illegal periods of turbot fishing were 2011 +/- 742 (CV: 0.37) in 2007 and 2294 +/- 806 (CV: 0.35) in 2008. The estimated range of harbour porpoise by-catch in the turbot fishery on the Turkish western Black Sea coast is between these two estimates. The by-caught harbour porpoises were between 1-8 years of age. About half of them were within the age range of 4 (26%) and 5 (21%) years old, and 78% were physically immature individuals. Turbot fishing carried out with bottom nets, especially in May and June, when turbot fishing is banned, is a threat to the sustainability of harbour porpoise stocks. Article in Journal/Newspaper Harbour porpoise Turbot İstanbul Üniversitesi Açık Erişim Sistemi Journal of the Marine Biological Association of the United Kingdom 96 4 993 998 |
institution |
Open Polar |
collection |
İstanbul Üniversitesi Açık Erişim Sistemi |
op_collection_id |
ftistanbuluniv |
language |
English |
topic |
DENİZ VE TATLISU BİYOLOJİSİ Su Hasadı Toprak ve Su Muhafazası ve Amenajmanı Toprak ve Bitki Besleme Ziraat Tarımsal Bilimler Tarım ve Çevre Bilimleri (AGE) Bitki ve Hayvan Bilimleri |
spellingShingle |
DENİZ VE TATLISU BİYOLOJİSİ Su Hasadı Toprak ve Su Muhafazası ve Amenajmanı Toprak ve Bitki Besleme Ziraat Tarımsal Bilimler Tarım ve Çevre Bilimleri (AGE) Bitki ve Hayvan Bilimleri Tonay, Arda M. Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008 |
topic_facet |
DENİZ VE TATLISU BİYOLOJİSİ Su Hasadı Toprak ve Su Muhafazası ve Amenajmanı Toprak ve Bitki Besleme Ziraat Tarımsal Bilimler Tarım ve Çevre Bilimleri (AGE) Bitki ve Hayvan Bilimleri |
description |
This is the first study estimating cetacean by-catch in the Turkish western Black Sea turbot fishery. One turbot fishing boat was observed during two fishing seasons, from April through July 2007 and April through mid-September 2008. During this time, 24 harbour porpoises and one bottlenose dolphin were caught in turbot trammel nets. The by-catch rate was found to be 0.18 for harbour porpoise and 0.01 for bottlenose dolphin individuals per kilometre in 2007, and 0.19 for harbour porpoise individuals in 2008. It is estimated that the total numbers of harbour porpoises killed in the Turkish western Black Sea during the legal fishing period (April and July) were 167 +/- 153 (CV: 0.92) in 2007 and 329 +/- 220 (CV: 0.67) in 2008, and the number killed during both legal and illegal periods of turbot fishing were 2011 +/- 742 (CV: 0.37) in 2007 and 2294 +/- 806 (CV: 0.35) in 2008. The estimated range of harbour porpoise by-catch in the turbot fishery on the Turkish western Black Sea coast is between these two estimates. The by-caught harbour porpoises were between 1-8 years of age. About half of them were within the age range of 4 (26%) and 5 (21%) years old, and 78% were physically immature individuals. Turbot fishing carried out with bottom nets, especially in May and June, when turbot fishing is banned, is a threat to the sustainability of harbour porpoise stocks. |
author2 |
İstanbul Üniversitesi , Su Ürünleri Fakültesi , Temel Bilimler 74372 |
format |
Article in Journal/Newspaper |
author |
Tonay, Arda M. |
author_facet |
Tonay, Arda M. |
author_sort |
Tonay, Arda M. |
title |
Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008 |
title_short |
Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008 |
title_full |
Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008 |
title_fullStr |
Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008 |
title_full_unstemmed |
Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008 |
title_sort |
estimates of cetacean by-catch in the turbot fishery on the turkish western black sea coast in 2007 and 2008 |
publishDate |
2016 |
url |
https://hdl.handle.net/20.500.12627/149377 https://doi.org/10.1017/s0025315416000060 |
genre |
Harbour porpoise Turbot |
genre_facet |
Harbour porpoise Turbot |
op_relation |
JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM Tonay A. M. , "Estimates of cetacean by-catch in the turbot fishery on the Turkish Western Black Sea Coast in 2007 and 2008", JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM, cilt.96, ss.993-998, 2016 0025-3154 av_e2fb0f17-32f9-492e-9c05-d390c6a9d1db vv_1032021 http://hdl.handle.net/20.500.12627/149377 https://doi.org/10.1017/s0025315416000060 96 4 993 998 |
op_doi |
https://doi.org/20.500.12627/149377 https://doi.org/10.1017/s0025315416000060 |
container_title |
Journal of the Marine Biological Association of the United Kingdom |
container_volume |
96 |
container_issue |
4 |
container_start_page |
993 |
op_container_end_page |
998 |
_version_ |
1766023005682532352 |