Satellite Telemetry Reveals Higher Fishing Mortality Rates Than Previously Estimated, Suggesting Overfishing of an Apex Marine Predator
Overfishing is a primary cause of population declines for many shark species of conservation concern. However, means of obtaining information on fishery interactions and mortality, necessary for the development of successful conservation strategies, are often fisheries-dependent and of questionable...
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ftnsoutheastern:oai:nsuworks.nova.edu:occ_facarticles-1818 2023-05-15T17:34:10+02:00 Satellite Telemetry Reveals Higher Fishing Mortality Rates Than Previously Estimated, Suggesting Overfishing of an Apex Marine Predator Byrne, Michael Cortes, Enric Vaudo, Jeremy Harvey, Guy Sampson, Mark Wetherbee, Bradley M. Shivji, Mahmood S. 2017-08-16T07:00:00Z https://nsuworks.nova.edu/occ_facarticles/807 unknown NSUWorks https://nsuworks.nova.edu/occ_facarticles/807 Marine & Environmental Sciences Faculty Articles Conservation Fisheries Isurus oxyrinchus Mortality Shortfin mako shark Stock assessment Marine Biology Oceanography and Atmospheric Sciences and Meteorology article 2017 ftnsoutheastern 2022-04-10T21:55:15Z Overfishing is a primary cause of population declines for many shark species of conservation concern. However, means of obtaining information on fishery interactions and mortality, necessary for the development of successful conservation strategies, are often fisheries-dependent and of questionable quality for many species of commercially exploited pelagic sharks. We used satellite telemetry as a fisheries-independent tool to document fisheries interactions, and quantify fishing mortality of the highly migratory shortfin mako shark (Isurus oxyrinchus) in the western North Atlantic Ocean. Forty satellite-tagged shortfin mako sharks tracked over 3 years entered the Exclusive Economic Zones of 19 countries and were harvested in fisheries of five countries, with 30% of tagged sharks harvested. Our tagging-derived estimates of instantaneous fishing mortality rates (F = 0.19–0.56) were 10-fold higher than previous estimates from fisheries-dependent data (approx. 0.015–0.024), suggesting data used in stock assessments may considerably underestimate fishing mortality. Additionally, our estimates of F were greater than those associated with maximum sustainable yield, suggesting a state of overfishing. This information has direct application to evaluations of stock status and for effective management of populations, and thus satellite tagging studies have potential to provide more accurate estimates of fishing mortality and survival than traditional fisheries-dependent methodology. Article in Journal/Newspaper North Atlantic Nova Southeastern University: NSU Works |
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Open Polar |
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Nova Southeastern University: NSU Works |
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ftnsoutheastern |
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topic |
Conservation Fisheries Isurus oxyrinchus Mortality Shortfin mako shark Stock assessment Marine Biology Oceanography and Atmospheric Sciences and Meteorology |
spellingShingle |
Conservation Fisheries Isurus oxyrinchus Mortality Shortfin mako shark Stock assessment Marine Biology Oceanography and Atmospheric Sciences and Meteorology Byrne, Michael Cortes, Enric Vaudo, Jeremy Harvey, Guy Sampson, Mark Wetherbee, Bradley M. Shivji, Mahmood S. Satellite Telemetry Reveals Higher Fishing Mortality Rates Than Previously Estimated, Suggesting Overfishing of an Apex Marine Predator |
topic_facet |
Conservation Fisheries Isurus oxyrinchus Mortality Shortfin mako shark Stock assessment Marine Biology Oceanography and Atmospheric Sciences and Meteorology |
description |
Overfishing is a primary cause of population declines for many shark species of conservation concern. However, means of obtaining information on fishery interactions and mortality, necessary for the development of successful conservation strategies, are often fisheries-dependent and of questionable quality for many species of commercially exploited pelagic sharks. We used satellite telemetry as a fisheries-independent tool to document fisheries interactions, and quantify fishing mortality of the highly migratory shortfin mako shark (Isurus oxyrinchus) in the western North Atlantic Ocean. Forty satellite-tagged shortfin mako sharks tracked over 3 years entered the Exclusive Economic Zones of 19 countries and were harvested in fisheries of five countries, with 30% of tagged sharks harvested. Our tagging-derived estimates of instantaneous fishing mortality rates (F = 0.19–0.56) were 10-fold higher than previous estimates from fisheries-dependent data (approx. 0.015–0.024), suggesting data used in stock assessments may considerably underestimate fishing mortality. Additionally, our estimates of F were greater than those associated with maximum sustainable yield, suggesting a state of overfishing. This information has direct application to evaluations of stock status and for effective management of populations, and thus satellite tagging studies have potential to provide more accurate estimates of fishing mortality and survival than traditional fisheries-dependent methodology. |
format |
Article in Journal/Newspaper |
author |
Byrne, Michael Cortes, Enric Vaudo, Jeremy Harvey, Guy Sampson, Mark Wetherbee, Bradley M. Shivji, Mahmood S. |
author_facet |
Byrne, Michael Cortes, Enric Vaudo, Jeremy Harvey, Guy Sampson, Mark Wetherbee, Bradley M. Shivji, Mahmood S. |
author_sort |
Byrne, Michael |
title |
Satellite Telemetry Reveals Higher Fishing Mortality Rates Than Previously Estimated, Suggesting Overfishing of an Apex Marine Predator |
title_short |
Satellite Telemetry Reveals Higher Fishing Mortality Rates Than Previously Estimated, Suggesting Overfishing of an Apex Marine Predator |
title_full |
Satellite Telemetry Reveals Higher Fishing Mortality Rates Than Previously Estimated, Suggesting Overfishing of an Apex Marine Predator |
title_fullStr |
Satellite Telemetry Reveals Higher Fishing Mortality Rates Than Previously Estimated, Suggesting Overfishing of an Apex Marine Predator |
title_full_unstemmed |
Satellite Telemetry Reveals Higher Fishing Mortality Rates Than Previously Estimated, Suggesting Overfishing of an Apex Marine Predator |
title_sort |
satellite telemetry reveals higher fishing mortality rates than previously estimated, suggesting overfishing of an apex marine predator |
publisher |
NSUWorks |
publishDate |
2017 |
url |
https://nsuworks.nova.edu/occ_facarticles/807 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Marine & Environmental Sciences Faculty Articles |
op_relation |
https://nsuworks.nova.edu/occ_facarticles/807 |
_version_ |
1766132915037536256 |