Impacts of area-based management on the population of northern shrimp, Pandalus borealis (Krøyer, 1838), in Isfjorden and Kongsfjorden, Svalbard.
Læst til 18.6.2015 The Svalbard shelf is identified as one of the chief fishing grounds for the Barents Sea shrimp fishery. While Kongsfjorden has been closed to commercial trawling in order to protect the scientific interests of the area, commercial harvesting continues in Isfjorden. In this study,...
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ftskemman:oai:skemman.is:1946/19625 2023-05-15T15:27:49+02:00 Impacts of area-based management on the population of northern shrimp, Pandalus borealis (Krøyer, 1838), in Isfjorden and Kongsfjorden, Svalbard. Andersen, Anne Kirstine D., 1987- Háskólinn á Akureyri 2014-09-09 application/pdf http://hdl.handle.net/1946/19625 en eng http://hdl.handle.net/1946/19625 Coastal and marine management University Centre of the Westfjords Haf- og strandsvæðastjórnun Háskólasetur Vestfjarða Meistaraprófsritgerðir Rækjuveiðar Fiskveiðistjórnun Thesis Master's 2014 ftskemman 2022-12-11T06:52:44Z Læst til 18.6.2015 The Svalbard shelf is identified as one of the chief fishing grounds for the Barents Sea shrimp fishery. While Kongsfjorden has been closed to commercial trawling in order to protect the scientific interests of the area, commercial harvesting continues in Isfjorden. In this study, trawl catches and population structure distributions of northern shrimp (Pandalus borealis) were analyzed in an investigation into the impacts of the different management strategies of the two fjords. Additionally, potential predation pressure was explored through abundance estimates of shrimp predators at various locations within the fjords. Stomach contents analysis identified the main predators, namely Atlantic cod (Gadus morhua), Greenland halibut (Reinhardtius hippoglossoides) and large polar cod (Boreogadus saida), but, with the exception of polar cod, there were no significant difference in abundance of these predators between fjords. Mix 3.0 modal analysis of length frequency distributions revealed no clear difference in growth or age at first female maturity between the fjords. However, shrimp in inner Isfjorden, where bottom temperatures are generally lower, exhibited a slight increase in age at female maturity, suggesting reduced growth rates. Generally, there were greater differences in population structure and abundances of both shrimp and predators within the fjords than between them. These results indicate that trawling has no significant effect on the distribution, abundance or population size structure of the shrimp. Instead, heterogeneity in shrimp population structure within each fjord suggested that shrimp utilize different subhabitats at different life stages. Further understanding of such preferences would be useful in the management of the shrimp fishery on the Svalbard shelf. Svalbard Environmental Protection Fund University Centre in Svalbard Norwegian Institute of Marine Research Akvaplan-niva Thesis atlantic cod Barents Sea Boreogadus saida Gadus morhua Greenland Isfjord* Isfjorden Kongsfjord* Kongsfjorden northern shrimp Pandalus borealis polar cod Svalbard University Centre in Svalbard Skemman (Iceland) Barents Sea Greenland Haf ENVELOPE(-19.699,-19.699,64.145,64.145) Niva ENVELOPE(23.913,23.913,66.136,66.136) Svalbard |
institution |
Open Polar |
collection |
Skemman (Iceland) |
op_collection_id |
ftskemman |
language |
English |
topic |
Coastal and marine management University Centre of the Westfjords Haf- og strandsvæðastjórnun Háskólasetur Vestfjarða Meistaraprófsritgerðir Rækjuveiðar Fiskveiðistjórnun |
spellingShingle |
Coastal and marine management University Centre of the Westfjords Haf- og strandsvæðastjórnun Háskólasetur Vestfjarða Meistaraprófsritgerðir Rækjuveiðar Fiskveiðistjórnun Andersen, Anne Kirstine D., 1987- Impacts of area-based management on the population of northern shrimp, Pandalus borealis (Krøyer, 1838), in Isfjorden and Kongsfjorden, Svalbard. |
topic_facet |
Coastal and marine management University Centre of the Westfjords Haf- og strandsvæðastjórnun Háskólasetur Vestfjarða Meistaraprófsritgerðir Rækjuveiðar Fiskveiðistjórnun |
description |
Læst til 18.6.2015 The Svalbard shelf is identified as one of the chief fishing grounds for the Barents Sea shrimp fishery. While Kongsfjorden has been closed to commercial trawling in order to protect the scientific interests of the area, commercial harvesting continues in Isfjorden. In this study, trawl catches and population structure distributions of northern shrimp (Pandalus borealis) were analyzed in an investigation into the impacts of the different management strategies of the two fjords. Additionally, potential predation pressure was explored through abundance estimates of shrimp predators at various locations within the fjords. Stomach contents analysis identified the main predators, namely Atlantic cod (Gadus morhua), Greenland halibut (Reinhardtius hippoglossoides) and large polar cod (Boreogadus saida), but, with the exception of polar cod, there were no significant difference in abundance of these predators between fjords. Mix 3.0 modal analysis of length frequency distributions revealed no clear difference in growth or age at first female maturity between the fjords. However, shrimp in inner Isfjorden, where bottom temperatures are generally lower, exhibited a slight increase in age at female maturity, suggesting reduced growth rates. Generally, there were greater differences in population structure and abundances of both shrimp and predators within the fjords than between them. These results indicate that trawling has no significant effect on the distribution, abundance or population size structure of the shrimp. Instead, heterogeneity in shrimp population structure within each fjord suggested that shrimp utilize different subhabitats at different life stages. Further understanding of such preferences would be useful in the management of the shrimp fishery on the Svalbard shelf. Svalbard Environmental Protection Fund University Centre in Svalbard Norwegian Institute of Marine Research Akvaplan-niva |
author2 |
Háskólinn á Akureyri |
format |
Thesis |
author |
Andersen, Anne Kirstine D., 1987- |
author_facet |
Andersen, Anne Kirstine D., 1987- |
author_sort |
Andersen, Anne Kirstine D., 1987- |
title |
Impacts of area-based management on the population of northern shrimp, Pandalus borealis (Krøyer, 1838), in Isfjorden and Kongsfjorden, Svalbard. |
title_short |
Impacts of area-based management on the population of northern shrimp, Pandalus borealis (Krøyer, 1838), in Isfjorden and Kongsfjorden, Svalbard. |
title_full |
Impacts of area-based management on the population of northern shrimp, Pandalus borealis (Krøyer, 1838), in Isfjorden and Kongsfjorden, Svalbard. |
title_fullStr |
Impacts of area-based management on the population of northern shrimp, Pandalus borealis (Krøyer, 1838), in Isfjorden and Kongsfjorden, Svalbard. |
title_full_unstemmed |
Impacts of area-based management on the population of northern shrimp, Pandalus borealis (Krøyer, 1838), in Isfjorden and Kongsfjorden, Svalbard. |
title_sort |
impacts of area-based management on the population of northern shrimp, pandalus borealis (krøyer, 1838), in isfjorden and kongsfjorden, svalbard. |
publishDate |
2014 |
url |
http://hdl.handle.net/1946/19625 |
long_lat |
ENVELOPE(-19.699,-19.699,64.145,64.145) ENVELOPE(23.913,23.913,66.136,66.136) |
geographic |
Barents Sea Greenland Haf Niva Svalbard |
geographic_facet |
Barents Sea Greenland Haf Niva Svalbard |
genre |
atlantic cod Barents Sea Boreogadus saida Gadus morhua Greenland Isfjord* Isfjorden Kongsfjord* Kongsfjorden northern shrimp Pandalus borealis polar cod Svalbard University Centre in Svalbard |
genre_facet |
atlantic cod Barents Sea Boreogadus saida Gadus morhua Greenland Isfjord* Isfjorden Kongsfjord* Kongsfjorden northern shrimp Pandalus borealis polar cod Svalbard University Centre in Svalbard |
op_relation |
http://hdl.handle.net/1946/19625 |
_version_ |
1766358218466918400 |