Nash equilibrium can resolve conflicting maximum sustainable yields in multi-species fisheries management
The current fisheries management goals set by the European Commission states that fish stocks should be harvested to deliver maximum sustainable yields (MSY) and simultaneously, management should take ecosystem considerations into account. This creates unsolved trade-offs for the management of the s...
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Online Access: | http://hdl.handle.net/11585/721316 https://doi.org/10.1093/icesjms/fsw148 |
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ftunibolognairis:oai:cris.unibo.it:11585/721316 2024-04-14T08:11:52+00:00 Nash equilibrium can resolve conflicting maximum sustainable yields in multi-species fisheries management Norrström N Casini M Holmgren N Norrström N Casini M Holmgren N 2017 STAMPA http://hdl.handle.net/11585/721316 https://doi.org/10.1093/icesjms/fsw148 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000397136400008 volume:74 firstpage:78 lastpage:90 numberofpages:13 journal:ICES JOURNAL OF MARINE SCIENCE http://hdl.handle.net/11585/721316 doi:10.1093/icesjms/fsw148 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85020882554 Baltic Sea multi-species reference points info:eu-repo/semantics/article 2017 ftunibolognairis https://doi.org/10.1093/icesjms/fsw148 2024-03-21T18:13:50Z The current fisheries management goals set by the European Commission states that fish stocks should be harvested to deliver maximum sustainable yields (MSY) and simultaneously, management should take ecosystem considerations into account. This creates unsolved trade-offs for the management of the stocks. We suggest a definition of a multi-species-MSY (MS-MSY) where no alternative fishing mortality (F) can increase yield (long term) for any ecologically interacting stock, given that the other stocks are fished at constant efforts (Fs). Such a MS-MSY can be solved through the game theoretic concept of a Nash equilibrium and here we explore two solutions to this conflict in the Baltic Sea. We maximize the sustainable yield of each stock under two constraints: first, we harvest the other stocks at a fixed F (FNE); second, we keep the spawning stock biomasses of the other stocks fixed [biomass Nash equilibrium (BNE)]. As a case study, we have developed a multi-species interaction stochastic operative model (MSI-SOM), which contains a SOM for each of the three dominant species of the Baltic Sea, the predator cod (Gadus morhua), and its prey herring (Clupea harengus), and sprat (Sprattus sprattus). For our Baltic Sea case, MS-MSYs exist under both the FNE and the BNE, but there is no guarantee that point solutions exists. We found that the prey species’ spawning stock biomasses are additive in the cod growth function, which allowed for a point solution in BNE. In the FNE, the herring MSY was found to be relatively insensitive to the other species’ fishing mortalities (F), which facilitated a point solution. The MSY targets of the BNE and the FNE differ slightly where the BNE gives higher predator yields and lower prey yields. Article in Journal/Newspaper Gadus morhua IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Nash ENVELOPE(-62.350,-62.350,-74.233,-74.233) ICES Journal of Marine Science 74 1 78 90 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
Baltic Sea multi-species reference points |
spellingShingle |
Baltic Sea multi-species reference points Norrström N Casini M Holmgren N Nash equilibrium can resolve conflicting maximum sustainable yields in multi-species fisheries management |
topic_facet |
Baltic Sea multi-species reference points |
description |
The current fisheries management goals set by the European Commission states that fish stocks should be harvested to deliver maximum sustainable yields (MSY) and simultaneously, management should take ecosystem considerations into account. This creates unsolved trade-offs for the management of the stocks. We suggest a definition of a multi-species-MSY (MS-MSY) where no alternative fishing mortality (F) can increase yield (long term) for any ecologically interacting stock, given that the other stocks are fished at constant efforts (Fs). Such a MS-MSY can be solved through the game theoretic concept of a Nash equilibrium and here we explore two solutions to this conflict in the Baltic Sea. We maximize the sustainable yield of each stock under two constraints: first, we harvest the other stocks at a fixed F (FNE); second, we keep the spawning stock biomasses of the other stocks fixed [biomass Nash equilibrium (BNE)]. As a case study, we have developed a multi-species interaction stochastic operative model (MSI-SOM), which contains a SOM for each of the three dominant species of the Baltic Sea, the predator cod (Gadus morhua), and its prey herring (Clupea harengus), and sprat (Sprattus sprattus). For our Baltic Sea case, MS-MSYs exist under both the FNE and the BNE, but there is no guarantee that point solutions exists. We found that the prey species’ spawning stock biomasses are additive in the cod growth function, which allowed for a point solution in BNE. In the FNE, the herring MSY was found to be relatively insensitive to the other species’ fishing mortalities (F), which facilitated a point solution. The MSY targets of the BNE and the FNE differ slightly where the BNE gives higher predator yields and lower prey yields. |
author2 |
Norrström N Casini M Holmgren N |
format |
Article in Journal/Newspaper |
author |
Norrström N Casini M Holmgren N |
author_facet |
Norrström N Casini M Holmgren N |
author_sort |
Norrström N |
title |
Nash equilibrium can resolve conflicting maximum sustainable yields in multi-species fisheries management |
title_short |
Nash equilibrium can resolve conflicting maximum sustainable yields in multi-species fisheries management |
title_full |
Nash equilibrium can resolve conflicting maximum sustainable yields in multi-species fisheries management |
title_fullStr |
Nash equilibrium can resolve conflicting maximum sustainable yields in multi-species fisheries management |
title_full_unstemmed |
Nash equilibrium can resolve conflicting maximum sustainable yields in multi-species fisheries management |
title_sort |
nash equilibrium can resolve conflicting maximum sustainable yields in multi-species fisheries management |
publishDate |
2017 |
url |
http://hdl.handle.net/11585/721316 https://doi.org/10.1093/icesjms/fsw148 |
long_lat |
ENVELOPE(-62.350,-62.350,-74.233,-74.233) |
geographic |
Nash |
geographic_facet |
Nash |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000397136400008 volume:74 firstpage:78 lastpage:90 numberofpages:13 journal:ICES JOURNAL OF MARINE SCIENCE http://hdl.handle.net/11585/721316 doi:10.1093/icesjms/fsw148 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85020882554 |
op_doi |
https://doi.org/10.1093/icesjms/fsw148 |
container_title |
ICES Journal of Marine Science |
container_volume |
74 |
container_issue |
1 |
container_start_page |
78 |
op_container_end_page |
90 |
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1796309608724168704 |