Intercalibration of survey methods using paired fishing operations and log-Gaussian Cox processes
We present a statistical method for intercalibration of fishery surveys methods, i.e. determining the difference in catchability and size selectivity of two methods, such as trawl gears or vessels, based on data from paired fishing operations. The model estimates the selectivity ratios in each lengt...
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2019
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ftdtupubl:oai:pure.atira.dk:publications/bc1bc6ab-53a1-445f-9c06-3a2e222c0239 2024-06-23T07:52:54+00:00 Intercalibration of survey methods using paired fishing operations and log-Gaussian Cox processes Thygesen, Uffe Høgsbro Kristensen, Kasper Jansen, Teunis Beyer, Jan E 2019 application/pdf https://orbit.dtu.dk/en/publications/bc1bc6ab-53a1-445f-9c06-3a2e222c0239 https://doi.org/10.1093/icesjms/fsy191 https://backend.orbit.dtu.dk/ws/files/223330882/Intercal.pdf eng eng https://orbit.dtu.dk/en/publications/bc1bc6ab-53a1-445f-9c06-3a2e222c0239 info:eu-repo/semantics/openAccess Thygesen , U H , Kristensen , K , Jansen , T & Beyer , J E 2019 , ' Intercalibration of survey methods using paired fishing operations and log-Gaussian Cox processes ' , ICES Journal of Marine Science , vol. 76 , no. 4 , pp. 1189-1199 . https://doi.org/10.1093/icesjms/fsy191 Intercalibration Log-Gaussian Cox processes Mixed-effects models Selectivity /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2019 ftdtupubl https://doi.org/10.1093/icesjms/fsy191 2024-06-11T14:52:03Z We present a statistical method for intercalibration of fishery surveys methods, i.e. determining the difference in catchability and size selectivity of two methods, such as trawl gears or vessels, based on data from paired fishing operations. The model estimates the selectivity ratios in each length class by modelling the size distribution of the underlying population at each station and the size-structured clustering of fish at small temporal and spatial scales. The model allows for overdispersion and correlation between catch counts in neighbouring size classes. This is obtained by assuming Poisson-distributed catch numbers conditional on unobserved log-Gaussian variables, i.e. the catch is modelled using log-Gaussian Cox processes. We apply the method to catches of hake (Merluccius paradoxus and M. capensis) in 341 paired trawl hauls performed by two different vessels, viz. the RV Dr Fridtjof Nansen and the FV Blue Sea, operating off the coast of Namibia. The results demonstrate that it is feasible to estimate the selectivity ratio in each size class, and to test statistically the hypothesis that the selectivity is independent of size or species. For the specific case, we find that differences between size classes and species are statistically significant. Article in Journal/Newspaper Fridtjof Nansen Technical University of Denmark: DTU Orbit Fridtjof ENVELOPE(-56.717,-56.717,-63.567,-63.567) Hake ENVELOPE(15.612,15.612,66.797,66.797) ICES Journal of Marine Science 76 4 1189 1199 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Intercalibration Log-Gaussian Cox processes Mixed-effects models Selectivity /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
Intercalibration Log-Gaussian Cox processes Mixed-effects models Selectivity /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Thygesen, Uffe Høgsbro Kristensen, Kasper Jansen, Teunis Beyer, Jan E Intercalibration of survey methods using paired fishing operations and log-Gaussian Cox processes |
topic_facet |
Intercalibration Log-Gaussian Cox processes Mixed-effects models Selectivity /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
We present a statistical method for intercalibration of fishery surveys methods, i.e. determining the difference in catchability and size selectivity of two methods, such as trawl gears or vessels, based on data from paired fishing operations. The model estimates the selectivity ratios in each length class by modelling the size distribution of the underlying population at each station and the size-structured clustering of fish at small temporal and spatial scales. The model allows for overdispersion and correlation between catch counts in neighbouring size classes. This is obtained by assuming Poisson-distributed catch numbers conditional on unobserved log-Gaussian variables, i.e. the catch is modelled using log-Gaussian Cox processes. We apply the method to catches of hake (Merluccius paradoxus and M. capensis) in 341 paired trawl hauls performed by two different vessels, viz. the RV Dr Fridtjof Nansen and the FV Blue Sea, operating off the coast of Namibia. The results demonstrate that it is feasible to estimate the selectivity ratio in each size class, and to test statistically the hypothesis that the selectivity is independent of size or species. For the specific case, we find that differences between size classes and species are statistically significant. |
format |
Article in Journal/Newspaper |
author |
Thygesen, Uffe Høgsbro Kristensen, Kasper Jansen, Teunis Beyer, Jan E |
author_facet |
Thygesen, Uffe Høgsbro Kristensen, Kasper Jansen, Teunis Beyer, Jan E |
author_sort |
Thygesen, Uffe Høgsbro |
title |
Intercalibration of survey methods using paired fishing operations and log-Gaussian Cox processes |
title_short |
Intercalibration of survey methods using paired fishing operations and log-Gaussian Cox processes |
title_full |
Intercalibration of survey methods using paired fishing operations and log-Gaussian Cox processes |
title_fullStr |
Intercalibration of survey methods using paired fishing operations and log-Gaussian Cox processes |
title_full_unstemmed |
Intercalibration of survey methods using paired fishing operations and log-Gaussian Cox processes |
title_sort |
intercalibration of survey methods using paired fishing operations and log-gaussian cox processes |
publishDate |
2019 |
url |
https://orbit.dtu.dk/en/publications/bc1bc6ab-53a1-445f-9c06-3a2e222c0239 https://doi.org/10.1093/icesjms/fsy191 https://backend.orbit.dtu.dk/ws/files/223330882/Intercal.pdf |
long_lat |
ENVELOPE(-56.717,-56.717,-63.567,-63.567) ENVELOPE(15.612,15.612,66.797,66.797) |
geographic |
Fridtjof Hake |
geographic_facet |
Fridtjof Hake |
genre |
Fridtjof Nansen |
genre_facet |
Fridtjof Nansen |
op_source |
Thygesen , U H , Kristensen , K , Jansen , T & Beyer , J E 2019 , ' Intercalibration of survey methods using paired fishing operations and log-Gaussian Cox processes ' , ICES Journal of Marine Science , vol. 76 , no. 4 , pp. 1189-1199 . https://doi.org/10.1093/icesjms/fsy191 |
op_relation |
https://orbit.dtu.dk/en/publications/bc1bc6ab-53a1-445f-9c06-3a2e222c0239 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/icesjms/fsy191 |
container_title |
ICES Journal of Marine Science |
container_volume |
76 |
container_issue |
4 |
container_start_page |
1189 |
op_container_end_page |
1199 |
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1802644335427059712 |