Hybrid experimental designs for joint estimation of absolute and relative retention curves for trawl gears
Abstract Methods for jointly estimating both the size-specific relative retention and absolute retention (retention probability) of two experimental trawl gears are considered. One approach would be to undertake comparative fishing of both gears, from which their comparative catchability can be esti...
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Oxford University Press (OUP)
2023
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsad171 https://academic.oup.com/icesjms/advance-article-pdf/doi/10.1093/icesjms/fsad171/53348371/fsad171.pdf |
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croxfordunivpr:10.1093/icesjms/fsad171 2023-12-31T10:07:03+01:00 Hybrid experimental designs for joint estimation of absolute and relative retention curves for trawl gears Millar, Russell B O'Neill, Finbarr 2023 http://dx.doi.org/10.1093/icesjms/fsad171 https://academic.oup.com/icesjms/advance-article-pdf/doi/10.1093/icesjms/fsad171/53348371/fsad171.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ ICES Journal of Marine Science ISSN 1054-3139 1095-9289 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2023 croxfordunivpr https://doi.org/10.1093/icesjms/fsad171 2023-12-06T08:45:58Z Abstract Methods for jointly estimating both the size-specific relative retention and absolute retention (retention probability) of two experimental trawl gears are considered. One approach would be to undertake comparative fishing of both gears, from which their comparative catchability can be estimated directly. If comparative catchability can be corrected for differing sampling effort and fishing efficiency of the two gears, then relative retention can be estimated. Furthermore, if a suitable functional form of the absolute retention curve is assumed, then estimates of absolute retention can potentially be obtained. However, these estimated retention curves are seen to have extremely large statistical variability and will not be useful in practice. On the other hand, if the gears are each fished with a non-selective control, then absolute retention can be directly estimated, from which estimates of relative retention can immediately be obtained. However, these estimates of relative retention have greater variability than would be obtained by comparative fishing with the same level of sampling effort. It is shown that a hybrid selectivity design that includes both comparative fishing of the experimental trawls and fishing with a non-selective control provides a more balanced approach. An extensive simulation study is conducted using scenarios based on recently published work on selectivity experiments targeting cod (Gadus Morhua) and hoki/blue grenadier (Macruronus novaezelandiae). Article in Journal/Newspaper Gadus morhua Oxford University Press (via Crossref) ICES Journal of Marine Science |
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Open Polar |
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Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Millar, Russell B Hybrid experimental designs for joint estimation of absolute and relative retention curves for trawl gears |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Methods for jointly estimating both the size-specific relative retention and absolute retention (retention probability) of two experimental trawl gears are considered. One approach would be to undertake comparative fishing of both gears, from which their comparative catchability can be estimated directly. If comparative catchability can be corrected for differing sampling effort and fishing efficiency of the two gears, then relative retention can be estimated. Furthermore, if a suitable functional form of the absolute retention curve is assumed, then estimates of absolute retention can potentially be obtained. However, these estimated retention curves are seen to have extremely large statistical variability and will not be useful in practice. On the other hand, if the gears are each fished with a non-selective control, then absolute retention can be directly estimated, from which estimates of relative retention can immediately be obtained. However, these estimates of relative retention have greater variability than would be obtained by comparative fishing with the same level of sampling effort. It is shown that a hybrid selectivity design that includes both comparative fishing of the experimental trawls and fishing with a non-selective control provides a more balanced approach. An extensive simulation study is conducted using scenarios based on recently published work on selectivity experiments targeting cod (Gadus Morhua) and hoki/blue grenadier (Macruronus novaezelandiae). |
author2 |
O'Neill, Finbarr |
format |
Article in Journal/Newspaper |
author |
Millar, Russell B |
author_facet |
Millar, Russell B |
author_sort |
Millar, Russell B |
title |
Hybrid experimental designs for joint estimation of absolute and relative retention curves for trawl gears |
title_short |
Hybrid experimental designs for joint estimation of absolute and relative retention curves for trawl gears |
title_full |
Hybrid experimental designs for joint estimation of absolute and relative retention curves for trawl gears |
title_fullStr |
Hybrid experimental designs for joint estimation of absolute and relative retention curves for trawl gears |
title_full_unstemmed |
Hybrid experimental designs for joint estimation of absolute and relative retention curves for trawl gears |
title_sort |
hybrid experimental designs for joint estimation of absolute and relative retention curves for trawl gears |
publisher |
Oxford University Press (OUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1093/icesjms/fsad171 https://academic.oup.com/icesjms/advance-article-pdf/doi/10.1093/icesjms/fsad171/53348371/fsad171.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
ICES Journal of Marine Science ISSN 1054-3139 1095-9289 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/icesjms/fsad171 |
container_title |
ICES Journal of Marine Science |
_version_ |
1786839276234735616 |