The assessment of competition between seals and commercial fisheries in the North Sea and the Antarctic
Most of the exploited fish stocks in the North Sea are also used as a food supply by a number of seal species; the same is true for some fish and invertebrate stocks in the Antarctic—although the fisheries there are, at present, much smaller than those in the North Sea. The information needed for a...
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Wiley
1988
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Online Access: | http://nora.nerc.ac.uk/id/eprint/521639/ https://doi.org/10.1111/j.1748-7692.1988.tb00179.x |
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ftnerc:oai:nora.nerc.ac.uk:521639 2023-05-15T13:41:42+02:00 The assessment of competition between seals and commercial fisheries in the North Sea and the Antarctic Harwood, John Croxall, John P. 1988 http://nora.nerc.ac.uk/id/eprint/521639/ https://doi.org/10.1111/j.1748-7692.1988.tb00179.x unknown Wiley Harwood, John; Croxall, John P. 1988 The assessment of competition between seals and commercial fisheries in the North Sea and the Antarctic. Marine Mammal Science, 4 (1). 13-33. https://doi.org/10.1111/j.1748-7692.1988.tb00179.x <https://doi.org/10.1111/j.1748-7692.1988.tb00179.x> Publication - Article PeerReviewed 1988 ftnerc https://doi.org/10.1111/j.1748-7692.1988.tb00179.x 2023-02-04T19:47:27Z Most of the exploited fish stocks in the North Sea are also used as a food supply by a number of seal species; the same is true for some fish and invertebrate stocks in the Antarctic—although the fisheries there are, at present, much smaller than those in the North Sea. The information needed for a critical assessment of such interactions is reviewed. Using existing techniques it is possible to estimate the quantity and size‐classes of each fish or invertebrate species consumed by seals and to compare this with the commercial catch. If fishing mortality is known, these estimates can be used to calculate the level of mortality imposed by the seals. However, a realistic evaluation requires information on the distribution and movements of the fish, the seals' feeding effort, and the fisheries effort in time and space. At present it is difficult or impossible to obtain this information, but recent technological developments in telemetry equipment will soon make it feasible. To assess the economic effects of changes in seal numbers on the fishery, or the ecological effects of changes in fisheries effort on seal populations, requires additional information on the responses of the fishery and the seals to changes in fish abundance, and of the commercial market to changes in the supply of fish. Article in Journal/Newspaper Antarc* Antarctic Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Marine Mammal Science 4 1 13 33 |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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unknown |
description |
Most of the exploited fish stocks in the North Sea are also used as a food supply by a number of seal species; the same is true for some fish and invertebrate stocks in the Antarctic—although the fisheries there are, at present, much smaller than those in the North Sea. The information needed for a critical assessment of such interactions is reviewed. Using existing techniques it is possible to estimate the quantity and size‐classes of each fish or invertebrate species consumed by seals and to compare this with the commercial catch. If fishing mortality is known, these estimates can be used to calculate the level of mortality imposed by the seals. However, a realistic evaluation requires information on the distribution and movements of the fish, the seals' feeding effort, and the fisheries effort in time and space. At present it is difficult or impossible to obtain this information, but recent technological developments in telemetry equipment will soon make it feasible. To assess the economic effects of changes in seal numbers on the fishery, or the ecological effects of changes in fisheries effort on seal populations, requires additional information on the responses of the fishery and the seals to changes in fish abundance, and of the commercial market to changes in the supply of fish. |
format |
Article in Journal/Newspaper |
author |
Harwood, John Croxall, John P. |
spellingShingle |
Harwood, John Croxall, John P. The assessment of competition between seals and commercial fisheries in the North Sea and the Antarctic |
author_facet |
Harwood, John Croxall, John P. |
author_sort |
Harwood, John |
title |
The assessment of competition between seals and commercial fisheries in the North Sea and the Antarctic |
title_short |
The assessment of competition between seals and commercial fisheries in the North Sea and the Antarctic |
title_full |
The assessment of competition between seals and commercial fisheries in the North Sea and the Antarctic |
title_fullStr |
The assessment of competition between seals and commercial fisheries in the North Sea and the Antarctic |
title_full_unstemmed |
The assessment of competition between seals and commercial fisheries in the North Sea and the Antarctic |
title_sort |
assessment of competition between seals and commercial fisheries in the north sea and the antarctic |
publisher |
Wiley |
publishDate |
1988 |
url |
http://nora.nerc.ac.uk/id/eprint/521639/ https://doi.org/10.1111/j.1748-7692.1988.tb00179.x |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Harwood, John; Croxall, John P. 1988 The assessment of competition between seals and commercial fisheries in the North Sea and the Antarctic. Marine Mammal Science, 4 (1). 13-33. https://doi.org/10.1111/j.1748-7692.1988.tb00179.x <https://doi.org/10.1111/j.1748-7692.1988.tb00179.x> |
op_doi |
https://doi.org/10.1111/j.1748-7692.1988.tb00179.x |
container_title |
Marine Mammal Science |
container_volume |
4 |
container_issue |
1 |
container_start_page |
13 |
op_container_end_page |
33 |
_version_ |
1766154141914103808 |