What's the catch with lumpsuckers? A North Atlantic study of seabird bycatch in lumpsucker gillnet fisheries

Signe Christensen-Dalsgaard*, Tycho Anker-Nilssen, Rory Crawford, Alexander Bond, Guðjón Már Sigurðsson, Gildas Glemarec, Erpur Snær Hansen, Martina Kadin, Lotte Kindt-Larsen, Mark Mallory, Flemming Ravn Merkel, Aevar Petersen, Jennifer Provencher, Kim Magnus Bærum

*Corresponding author for this work

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Abstract

Worldwide, incidental bycatch in fisheries is a conservation threat to many seabird species. Although knowledge on bycatch of seabirds has increased in the last decade, most stems from longline fisheries and the impacts of coastal gillnet fisheries are poorly understood. Gillnet fishing for North Atlantic lumpsucker (Cyclopterus lumpus) is one such fishery. We collated and synthesized the available information on seabird bycatch in lumpsucker gillnet fisheries across the entire geographical range to estimate and infer the magnitude of their impact on the affected seabird populations. Most birds killed were diving ducks, cormorants and auks, and each year locally high numbers of seabirds were taken as bycatch. We found large differences in bycatch rates among countries. The estimated mean bycatch in Iceland was 2.43 birds/trip, while the estimates in Norway was 0.44 and 0.39 birds/trip, respectively. The large disparities between estimates might reflect large spatial differences in bycatch rates, but could partly also arise due to distinctions in data recorded by onboard inspectors (Iceland), self-administered registration (Norway) and direct observations by cameras (Denmark). We show that lumpsucker gillnet fisheries might pose a significant risk to some populations of diving seabirds. However, a distinct data deficiency on seabird bycatch in terms of spatio-temporal coverage and the age and origins of the birds killed, limited our abilities to fully assess the extent and population consequences of the bycatch. Our results highlight the need for a joint effort among countries to standardize monitoring methods to better document the impact of these fisheries on seabirds.

Original languageEnglish
Article number108278
JournalBiological Conservation
Volume240
ISSN0006-3207
DOIs
Publication statusPublished - 2019

Keywords

  • Bycatch
  • Cyclopterus lumpus
  • Fisheries
  • Gillnets
  • North Atlantic
  • Seabirds

Cite this

Christensen-Dalsgaard, S., Anker-Nilssen, T., Crawford, R., Bond, A., Sigurðsson, G. M., Glemarec, G., ... Bærum, K. M. (2019). What's the catch with lumpsuckers? A North Atlantic study of seabird bycatch in lumpsucker gillnet fisheries. Biological Conservation, 240, [108278]. https://doi.org/10.1016/j.biocon.2019.108278
Christensen-Dalsgaard, Signe ; Anker-Nilssen, Tycho ; Crawford, Rory ; Bond, Alexander ; Sigurðsson, Guðjón Már ; Glemarec, Gildas ; Hansen, Erpur Snær ; Kadin, Martina ; Kindt-Larsen, Lotte ; Mallory, Mark ; Merkel, Flemming Ravn ; Petersen, Aevar ; Provencher, Jennifer ; Bærum, Kim Magnus. / What's the catch with lumpsuckers? A North Atlantic study of seabird bycatch in lumpsucker gillnet fisheries. In: Biological Conservation. 2019 ; Vol. 240.
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abstract = "Worldwide, incidental bycatch in fisheries is a conservation threat to many seabird species. Although knowledge on bycatch of seabirds has increased in the last decade, most stems from longline fisheries and the impacts of coastal gillnet fisheries are poorly understood. Gillnet fishing for North Atlantic lumpsucker (Cyclopterus lumpus) is one such fishery. We collated and synthesized the available information on seabird bycatch in lumpsucker gillnet fisheries across the entire geographical range to estimate and infer the magnitude of their impact on the affected seabird populations. Most birds killed were diving ducks, cormorants and auks, and each year locally high numbers of seabirds were taken as bycatch. We found large differences in bycatch rates among countries. The estimated mean bycatch in Iceland was 2.43 birds/trip, while the estimates in Norway was 0.44 and 0.39 birds/trip, respectively. The large disparities between estimates might reflect large spatial differences in bycatch rates, but could partly also arise due to distinctions in data recorded by onboard inspectors (Iceland), self-administered registration (Norway) and direct observations by cameras (Denmark). We show that lumpsucker gillnet fisheries might pose a significant risk to some populations of diving seabirds. However, a distinct data deficiency on seabird bycatch in terms of spatio-temporal coverage and the age and origins of the birds killed, limited our abilities to fully assess the extent and population consequences of the bycatch. Our results highlight the need for a joint effort among countries to standardize monitoring methods to better document the impact of these fisheries on seabirds.",
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author = "Signe Christensen-Dalsgaard and Tycho Anker-Nilssen and Rory Crawford and Alexander Bond and Sigur{\dh}sson, {Gu{\dh}j{\'o}n M{\'a}r} and Gildas Glemarec and Hansen, {Erpur Sn{\ae}r} and Martina Kadin and Lotte Kindt-Larsen and Mark Mallory and Merkel, {Flemming Ravn} and Aevar Petersen and Jennifer Provencher and B{\ae}rum, {Kim Magnus}",
year = "2019",
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Christensen-Dalsgaard, S, Anker-Nilssen, T, Crawford, R, Bond, A, Sigurðsson, GM, Glemarec, G, Hansen, ES, Kadin, M, Kindt-Larsen, L, Mallory, M, Merkel, FR, Petersen, A, Provencher, J & Bærum, KM 2019, 'What's the catch with lumpsuckers? A North Atlantic study of seabird bycatch in lumpsucker gillnet fisheries', Biological Conservation, vol. 240, 108278. https://doi.org/10.1016/j.biocon.2019.108278

What's the catch with lumpsuckers? A North Atlantic study of seabird bycatch in lumpsucker gillnet fisheries. / Christensen-Dalsgaard, Signe; Anker-Nilssen, Tycho; Crawford, Rory; Bond, Alexander; Sigurðsson, Guðjón Már; Glemarec, Gildas; Hansen, Erpur Snær; Kadin, Martina; Kindt-Larsen, Lotte; Mallory, Mark; Merkel, Flemming Ravn; Petersen, Aevar; Provencher, Jennifer; Bærum, Kim Magnus.

In: Biological Conservation, Vol. 240, 108278, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - What's the catch with lumpsuckers? A North Atlantic study of seabird bycatch in lumpsucker gillnet fisheries

AU - Christensen-Dalsgaard, Signe

AU - Anker-Nilssen, Tycho

AU - Crawford, Rory

AU - Bond, Alexander

AU - Sigurðsson, Guðjón Már

AU - Glemarec, Gildas

AU - Hansen, Erpur Snær

AU - Kadin, Martina

AU - Kindt-Larsen, Lotte

AU - Mallory, Mark

AU - Merkel, Flemming Ravn

AU - Petersen, Aevar

AU - Provencher, Jennifer

AU - Bærum, Kim Magnus

PY - 2019

Y1 - 2019

N2 - Worldwide, incidental bycatch in fisheries is a conservation threat to many seabird species. Although knowledge on bycatch of seabirds has increased in the last decade, most stems from longline fisheries and the impacts of coastal gillnet fisheries are poorly understood. Gillnet fishing for North Atlantic lumpsucker (Cyclopterus lumpus) is one such fishery. We collated and synthesized the available information on seabird bycatch in lumpsucker gillnet fisheries across the entire geographical range to estimate and infer the magnitude of their impact on the affected seabird populations. Most birds killed were diving ducks, cormorants and auks, and each year locally high numbers of seabirds were taken as bycatch. We found large differences in bycatch rates among countries. The estimated mean bycatch in Iceland was 2.43 birds/trip, while the estimates in Norway was 0.44 and 0.39 birds/trip, respectively. The large disparities between estimates might reflect large spatial differences in bycatch rates, but could partly also arise due to distinctions in data recorded by onboard inspectors (Iceland), self-administered registration (Norway) and direct observations by cameras (Denmark). We show that lumpsucker gillnet fisheries might pose a significant risk to some populations of diving seabirds. However, a distinct data deficiency on seabird bycatch in terms of spatio-temporal coverage and the age and origins of the birds killed, limited our abilities to fully assess the extent and population consequences of the bycatch. Our results highlight the need for a joint effort among countries to standardize monitoring methods to better document the impact of these fisheries on seabirds.

AB - Worldwide, incidental bycatch in fisheries is a conservation threat to many seabird species. Although knowledge on bycatch of seabirds has increased in the last decade, most stems from longline fisheries and the impacts of coastal gillnet fisheries are poorly understood. Gillnet fishing for North Atlantic lumpsucker (Cyclopterus lumpus) is one such fishery. We collated and synthesized the available information on seabird bycatch in lumpsucker gillnet fisheries across the entire geographical range to estimate and infer the magnitude of their impact on the affected seabird populations. Most birds killed were diving ducks, cormorants and auks, and each year locally high numbers of seabirds were taken as bycatch. We found large differences in bycatch rates among countries. The estimated mean bycatch in Iceland was 2.43 birds/trip, while the estimates in Norway was 0.44 and 0.39 birds/trip, respectively. The large disparities between estimates might reflect large spatial differences in bycatch rates, but could partly also arise due to distinctions in data recorded by onboard inspectors (Iceland), self-administered registration (Norway) and direct observations by cameras (Denmark). We show that lumpsucker gillnet fisheries might pose a significant risk to some populations of diving seabirds. However, a distinct data deficiency on seabird bycatch in terms of spatio-temporal coverage and the age and origins of the birds killed, limited our abilities to fully assess the extent and population consequences of the bycatch. Our results highlight the need for a joint effort among countries to standardize monitoring methods to better document the impact of these fisheries on seabirds.

KW - Bycatch

KW - Cyclopterus lumpus

KW - Fisheries

KW - Gillnets

KW - North Atlantic

KW - Seabirds

U2 - 10.1016/j.biocon.2019.108278

DO - 10.1016/j.biocon.2019.108278

M3 - Journal article

AN - SCOPUS:85074511836

VL - 240

JO - Biological Conservation

JF - Biological Conservation

SN - 0006-3207

M1 - 108278

ER -