Dive to survive: effects of capture depth on barotrauma and post-release survival of Atlantic cod (Gadus morhua) in recreational fisheries
Atlantic cod (Gadus morhua) caught in recreational fisheries are commonly released, often with barotrauma after rapid decompression. Mouth-hooked, non-bleeding cod kept in a floating net pen showed mortalities =40% when angled from >50 m depth, likely because of cumulative stress from ongoing bar...
Published in: | ICES Journal of Marine Science |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2015
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Online Access: | https://doi.org/10.1093/icesjms/fsv102 https://www.openagrar.de/receive/timport_mods_00029927 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029927/dn055257.pdf http://icesjms.oxfordjournals.org/content/early/2015/06/03/icesjms.fsv102 |
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ftopenagrar:oai:www.openagrar.de:timport_mods_00029927 2024-09-15T17:55:30+00:00 Dive to survive: effects of capture depth on barotrauma and post-release survival of Atlantic cod (Gadus morhua) in recreational fisheries Ferter, Keno Weltersbach, Marc Simon Humborstad, Odd-Borre Fjelldal, Per Gunnar Sambraus, Florian Strehlow, Harry Vincent Volstad, Jon Helge 2015 14 https://doi.org/10.1093/icesjms/fsv102 https://www.openagrar.de/receive/timport_mods_00029927 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029927/dn055257.pdf http://icesjms.oxfordjournals.org/content/early/2015/06/03/icesjms.fsv102 eng eng ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/DOI:10.1093/icesjms/fsv102 https://www.openagrar.de/receive/timport_mods_00029927 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029927/dn055257.pdf http://icesjms.oxfordjournals.org/content/early/2015/06/03/icesjms.fsv102 only signed in user info:eu-repo/semantics/restrictedAccess article Text barotrauma signs catch-and-release containment study gas embolism post-release mortality recreational fishing swim bladder rupture article Text doc-type:article 2015 ftopenagrar https://doi.org/10.1093/icesjms/fsv102 2024-07-08T23:56:24Z Atlantic cod (Gadus morhua) caught in recreational fisheries are commonly released, often with barotrauma after rapid decompression. Mouth-hooked, non-bleeding cod kept in a floating net pen showed mortalities =40% when angled from >50 m depth, likely because of cumulative stress from ongoing barotrauma and exposure to warm surface water. In a natural setting, however, cod have the opportunity to descend after release and are not restricted to the surface. In a follow-up study, 97.8% of similarly selected cod managed to dive following immediate release, whereas 2.2% were floaters. No mortality was observed for divers kept in cages, which were lowered to capture depth for 72 h. While the floaters would likely have died in a natural setting, no mortality was observed when they were recompressed and kept at capture depth for 72 h. The occurrence of swim bladder ruptures, swollen coelomic cavities, venous gas embolisms, and gas release around the anus was significantly influenced by capture depth (range 0–90 m). A supplementary radiology study showed inflated swim bladders in 87% of the cod after 72 h, and most barotrauma signs had disappeared after 1 month. This study encourages investigation of survival potential for physoclistous species when high mortalities are assumed but undocumented. Matching natural post-release and containment environment is essential in the experimental setup, as failure to do so may bias survival estimates, particularly when a thermocline is present. Assuming minimal predation, short-term mortality of cod experiencing barotrauma is negligible if cod submerge quickly by themselves and are otherwise not substantially injured. Survival of floaters may be increased by forced recompression to capture depth. Sublethal and long-term impacts of barotrauma remain to be studied. To ensure that cod have sufficient energy to submerge, anglers are encouraged to avoid fighting the fish to exhaustion and to minimize handling before release. Article in Journal/Newspaper atlantic cod Gadus morhua OpenAgrar (OA) ICES Journal of Marine Science 72 8 2467 2481 |
institution |
Open Polar |
collection |
OpenAgrar (OA) |
op_collection_id |
ftopenagrar |
language |
English |
topic |
article Text barotrauma signs catch-and-release containment study gas embolism post-release mortality recreational fishing swim bladder rupture |
spellingShingle |
article Text barotrauma signs catch-and-release containment study gas embolism post-release mortality recreational fishing swim bladder rupture Ferter, Keno Weltersbach, Marc Simon Humborstad, Odd-Borre Fjelldal, Per Gunnar Sambraus, Florian Strehlow, Harry Vincent Volstad, Jon Helge Dive to survive: effects of capture depth on barotrauma and post-release survival of Atlantic cod (Gadus morhua) in recreational fisheries |
topic_facet |
article Text barotrauma signs catch-and-release containment study gas embolism post-release mortality recreational fishing swim bladder rupture |
description |
Atlantic cod (Gadus morhua) caught in recreational fisheries are commonly released, often with barotrauma after rapid decompression. Mouth-hooked, non-bleeding cod kept in a floating net pen showed mortalities =40% when angled from >50 m depth, likely because of cumulative stress from ongoing barotrauma and exposure to warm surface water. In a natural setting, however, cod have the opportunity to descend after release and are not restricted to the surface. In a follow-up study, 97.8% of similarly selected cod managed to dive following immediate release, whereas 2.2% were floaters. No mortality was observed for divers kept in cages, which were lowered to capture depth for 72 h. While the floaters would likely have died in a natural setting, no mortality was observed when they were recompressed and kept at capture depth for 72 h. The occurrence of swim bladder ruptures, swollen coelomic cavities, venous gas embolisms, and gas release around the anus was significantly influenced by capture depth (range 0–90 m). A supplementary radiology study showed inflated swim bladders in 87% of the cod after 72 h, and most barotrauma signs had disappeared after 1 month. This study encourages investigation of survival potential for physoclistous species when high mortalities are assumed but undocumented. Matching natural post-release and containment environment is essential in the experimental setup, as failure to do so may bias survival estimates, particularly when a thermocline is present. Assuming minimal predation, short-term mortality of cod experiencing barotrauma is negligible if cod submerge quickly by themselves and are otherwise not substantially injured. Survival of floaters may be increased by forced recompression to capture depth. Sublethal and long-term impacts of barotrauma remain to be studied. To ensure that cod have sufficient energy to submerge, anglers are encouraged to avoid fighting the fish to exhaustion and to minimize handling before release. |
format |
Article in Journal/Newspaper |
author |
Ferter, Keno Weltersbach, Marc Simon Humborstad, Odd-Borre Fjelldal, Per Gunnar Sambraus, Florian Strehlow, Harry Vincent Volstad, Jon Helge |
author_facet |
Ferter, Keno Weltersbach, Marc Simon Humborstad, Odd-Borre Fjelldal, Per Gunnar Sambraus, Florian Strehlow, Harry Vincent Volstad, Jon Helge |
author_sort |
Ferter, Keno |
title |
Dive to survive: effects of capture depth on barotrauma and post-release survival of Atlantic cod (Gadus morhua) in recreational fisheries |
title_short |
Dive to survive: effects of capture depth on barotrauma and post-release survival of Atlantic cod (Gadus morhua) in recreational fisheries |
title_full |
Dive to survive: effects of capture depth on barotrauma and post-release survival of Atlantic cod (Gadus morhua) in recreational fisheries |
title_fullStr |
Dive to survive: effects of capture depth on barotrauma and post-release survival of Atlantic cod (Gadus morhua) in recreational fisheries |
title_full_unstemmed |
Dive to survive: effects of capture depth on barotrauma and post-release survival of Atlantic cod (Gadus morhua) in recreational fisheries |
title_sort |
dive to survive: effects of capture depth on barotrauma and post-release survival of atlantic cod (gadus morhua) in recreational fisheries |
publishDate |
2015 |
url |
https://doi.org/10.1093/icesjms/fsv102 https://www.openagrar.de/receive/timport_mods_00029927 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029927/dn055257.pdf http://icesjms.oxfordjournals.org/content/early/2015/06/03/icesjms.fsv102 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/DOI:10.1093/icesjms/fsv102 https://www.openagrar.de/receive/timport_mods_00029927 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029927/dn055257.pdf http://icesjms.oxfordjournals.org/content/early/2015/06/03/icesjms.fsv102 |
op_rights |
only signed in user info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1093/icesjms/fsv102 |
container_title |
ICES Journal of Marine Science |
container_volume |
72 |
container_issue |
8 |
container_start_page |
2467 |
op_container_end_page |
2481 |
_version_ |
1810431773346103296 |