Dynamics of closed areas in Norway lobster fisheries
Dynamics of closed areas in Norway lobster fisheries
A dynamic, age-structured population model was developed to investigate the potential effects of introducing a closed area to a fishery for a species with limited adult mobility and planktonic dispersal of larvae, using biological and fishery information from a Norway lobster fishery in eastern Scotland. Simulated closure of part of the fishing grounds led to a long-term increase in total biomass and recruitment to the fished zone, but the larval subsidy did not compensate for the loss of fishing ground, and fishery yield was reduced under all modelled combinations of closed-area size and prior fishing effort. Concentration of effort in the fished zone and increased recruitment there led to reduced average size, and therefore value, of animals in the catch, as well as increased destruction of biomass by discarding undersized lobsters. Implementation of a closed area also led to oscillations in stock biomass, recruitment, and yield over several years after the closure, particularly with large closed areas and high fishing effort.
closed area, density-dependence, fisheries management, marine protected area, Nephrops norvegicus, simulation modelling, transient response
1600-1609
Smith, I. Philip
e04fd22f-641e-4ed5-ba96-da977aef781f
Jensen, Antony C.
ff1cabd2-e6fa-4e34-9a39-5097e2bc5f85
December 2008
Smith, I. Philip
e04fd22f-641e-4ed5-ba96-da977aef781f
Jensen, Antony C.
ff1cabd2-e6fa-4e34-9a39-5097e2bc5f85
Smith, I. Philip and Jensen, Antony C.
(2008)
Dynamics of closed areas in Norway lobster fisheries.
ICES Journal of Marine Science, 65 (9), .
(doi:10.1093/icesjms/fsn170).
Abstract
A dynamic, age-structured population model was developed to investigate the potential effects of introducing a closed area to a fishery for a species with limited adult mobility and planktonic dispersal of larvae, using biological and fishery information from a Norway lobster fishery in eastern Scotland. Simulated closure of part of the fishing grounds led to a long-term increase in total biomass and recruitment to the fished zone, but the larval subsidy did not compensate for the loss of fishing ground, and fishery yield was reduced under all modelled combinations of closed-area size and prior fishing effort. Concentration of effort in the fished zone and increased recruitment there led to reduced average size, and therefore value, of animals in the catch, as well as increased destruction of biomass by discarding undersized lobsters. Implementation of a closed area also led to oscillations in stock biomass, recruitment, and yield over several years after the closure, particularly with large closed areas and high fishing effort.
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Published date: December 2008
Keywords:
closed area, density-dependence, fisheries management, marine protected area, Nephrops norvegicus, simulation modelling, transient response
Identifiers
Local EPrints ID: 64574
URI: http://eprints.soton.ac.uk/id/eprint/64574
ISSN: 1054-3139
PURE UUID: 30c22243-78dd-4f2a-9cc7-66796131a126
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Date deposited: 22 Dec 2008
Last modified: 23 Jul 2022 01:32
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Author:
I. Philip Smith
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