Estimating The Post-Release Mortality Of Atlantic Cod (Gadus Morhua) In The Southern Gulf Of Maine Commercial Lobster Fishery
Atlantic cod, Gadus morhua, in the Gulf of Maine has experienced heightened fishing-induced mortality since the 1990s, leading to the lowest population abundances in recorded history. Unaccounted discard mortalities within Gulf of Maine commercial fisheries may be impairing recovery efforts in this...
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ftunivnewengmai:oai:dune.une.edu:theses-1264 2023-05-15T15:26:57+02:00 Estimating The Post-Release Mortality Of Atlantic Cod (Gadus Morhua) In The Southern Gulf Of Maine Commercial Lobster Fishery Sweezey, Brett 2018-08-01T07:00:00Z application/pdf https://dune.une.edu/theses/265 https://dune.une.edu/cgi/viewcontent.cgi?article=1264&context=theses unknown DUNE: DigitalUNE https://dune.une.edu/theses/265 https://dune.une.edu/cgi/viewcontent.cgi?article=1264&context=theses © 2018 Brett Sweezey All Theses And Dissertations Marine Biology text 2018 ftunivnewengmai 2022-01-22T20:15:57Z Atlantic cod, Gadus morhua, in the Gulf of Maine has experienced heightened fishing-induced mortality since the 1990s, leading to the lowest population abundances in recorded history. Unaccounted discard mortalities within Gulf of Maine commercial fisheries may be impairing recovery efforts in this and other cod populations. With over 4 million actively fished lobster traps, the Maine commercial lobster fishery has been suggested to be a significant contributor to cod mortality rates within this region. Therefore, the discard mortality rate of Atlantic cod captured by commercial lobster gear was examined to assess its potential influence on recovery efforts using acoustic transmitters and observations of individual viability. In total, 111 cod were captured over 105 fishing trips in 2016-2017, consisting of 18,853 individual trap hauls. A subsample of 54 cod were externally tagged with acoustic transmitters and observed post-release. The observed frequency of injuries following trap hauling included: uninjured (60.0%), slight injured (32.2%), severely injured (2.5%), and deceased (9.3%). Through the use of a mixture-distribution parametric model the discard mortality rate within the southern Maine commercial lobster fishery is estimated to be 24.8%. Text atlantic cod Gadus morhua University of New England: DUNE (DigitalUNE) |
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University of New England: DUNE (DigitalUNE) |
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Marine Biology |
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Marine Biology Sweezey, Brett Estimating The Post-Release Mortality Of Atlantic Cod (Gadus Morhua) In The Southern Gulf Of Maine Commercial Lobster Fishery |
topic_facet |
Marine Biology |
description |
Atlantic cod, Gadus morhua, in the Gulf of Maine has experienced heightened fishing-induced mortality since the 1990s, leading to the lowest population abundances in recorded history. Unaccounted discard mortalities within Gulf of Maine commercial fisheries may be impairing recovery efforts in this and other cod populations. With over 4 million actively fished lobster traps, the Maine commercial lobster fishery has been suggested to be a significant contributor to cod mortality rates within this region. Therefore, the discard mortality rate of Atlantic cod captured by commercial lobster gear was examined to assess its potential influence on recovery efforts using acoustic transmitters and observations of individual viability. In total, 111 cod were captured over 105 fishing trips in 2016-2017, consisting of 18,853 individual trap hauls. A subsample of 54 cod were externally tagged with acoustic transmitters and observed post-release. The observed frequency of injuries following trap hauling included: uninjured (60.0%), slight injured (32.2%), severely injured (2.5%), and deceased (9.3%). Through the use of a mixture-distribution parametric model the discard mortality rate within the southern Maine commercial lobster fishery is estimated to be 24.8%. |
format |
Text |
author |
Sweezey, Brett |
author_facet |
Sweezey, Brett |
author_sort |
Sweezey, Brett |
title |
Estimating The Post-Release Mortality Of Atlantic Cod (Gadus Morhua) In The Southern Gulf Of Maine Commercial Lobster Fishery |
title_short |
Estimating The Post-Release Mortality Of Atlantic Cod (Gadus Morhua) In The Southern Gulf Of Maine Commercial Lobster Fishery |
title_full |
Estimating The Post-Release Mortality Of Atlantic Cod (Gadus Morhua) In The Southern Gulf Of Maine Commercial Lobster Fishery |
title_fullStr |
Estimating The Post-Release Mortality Of Atlantic Cod (Gadus Morhua) In The Southern Gulf Of Maine Commercial Lobster Fishery |
title_full_unstemmed |
Estimating The Post-Release Mortality Of Atlantic Cod (Gadus Morhua) In The Southern Gulf Of Maine Commercial Lobster Fishery |
title_sort |
estimating the post-release mortality of atlantic cod (gadus morhua) in the southern gulf of maine commercial lobster fishery |
publisher |
DUNE: DigitalUNE |
publishDate |
2018 |
url |
https://dune.une.edu/theses/265 https://dune.une.edu/cgi/viewcontent.cgi?article=1264&context=theses |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
All Theses And Dissertations |
op_relation |
https://dune.une.edu/theses/265 https://dune.une.edu/cgi/viewcontent.cgi?article=1264&context=theses |
op_rights |
© 2018 Brett Sweezey |
_version_ |
1766357420746997760 |