Comparison of three methods for identification of redfish ( Sebastes mentella and S. norvegicus ) from the Greenland east coast
In management of fisheries, knowledge about the species is crucial due to differences in life history traits. The first step is therefore species identification. For many species this task is straightforward, however for some species e.g. the two species of Atlantic redfish Sebastes mentella and Seb...
Published in: | Fisheries Research |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://pure.au.dk/portal/en/publications/c49f9159-e0b3-4cfe-bfec-5011cfeb3353 https://doi.org/10.1016/j.fishres.2018.01.003 |
id |
ftuniaarhuspubl:oai:pure.atira.dk:publications/c49f9159-e0b3-4cfe-bfec-5011cfeb3353 |
---|---|
record_format |
openpolar |
spelling |
ftuniaarhuspubl:oai:pure.atira.dk:publications/c49f9159-e0b3-4cfe-bfec-5011cfeb3353 2024-02-11T10:02:00+01:00 Comparison of three methods for identification of redfish ( Sebastes mentella and S. norvegicus ) from the Greenland east coast Christensen, Helle Torp Riget, Frank Backea, Marie Balslev Saha, Atal Johansen, Torild Hedeholm, Rasmus B. 2018-05 https://pure.au.dk/portal/en/publications/c49f9159-e0b3-4cfe-bfec-5011cfeb3353 https://doi.org/10.1016/j.fishres.2018.01.003 eng eng https://pure.au.dk/portal/en/publications/c49f9159-e0b3-4cfe-bfec-5011cfeb3353 info:eu-repo/semantics/restrictedAccess Christensen , H T , Riget , F , Backea , M B , Saha , A , Johansen , T & Hedeholm , R B 2018 , ' Comparison of three methods for identification of redfish ( Sebastes mentella and S. norvegicus ) from the Greenland east coast ' , Fisheries Research , vol. 201 , pp. 11-17 . https://doi.org/10.1016/j.fishres.2018.01.003 Species separation Fisheries management Otolith Shape analysis Microsatellites OTOLITH SHAPE-ANALYSIS NORTH-ATLANTIC STOCK MARINUS DISCRIMINATION SEPARATION SIZE COD AGE article 2018 ftuniaarhuspubl https://doi.org/10.1016/j.fishres.2018.01.003 2024-01-24T23:59:26Z In management of fisheries, knowledge about the species is crucial due to differences in life history traits. The first step is therefore species identification. For many species this task is straightforward, however for some species e.g. the two species of Atlantic redfish Sebastes mentella and Sebastes norvegicus, it can be difficult for an untrained eye. With the goal to separate the two species, we analysed otolith shape variation of S. mentella and S. norvegicus caught on the continental slope of East Greenland using the R package "Shape R". Results were evaluated against genetic analysis of the same fish, and compared to results of both a visual identification of the two species and a separation based on a linear discriminant analysis on standardised values of fish length, fish weight and otolith weight. It was concluded that the objective otolith shape analysis using the Shape R package analysis achieve a reasonable classification success, however with a clear bias towards S. mentella. Classification using the otolith weight achieved a slightly higher success than the shape analysis making it a promising method. Furthermore, the method is at the same time both objective, less time consuming than the otolith shape analysis and less expensive than genetic analysis. However, the visual classification method of the whole fish had the highest success rate of the three tested methods, which despite the need for trained technicians makes it the most successful method. Article in Journal/Newspaper Atlantic redfish East Greenland Greenland North Atlantic Sebastes mentella Sebastes norvegicus Aarhus University: Research Greenland Fisheries Research 201 11 17 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Species separation Fisheries management Otolith Shape analysis Microsatellites OTOLITH SHAPE-ANALYSIS NORTH-ATLANTIC STOCK MARINUS DISCRIMINATION SEPARATION SIZE COD AGE |
spellingShingle |
Species separation Fisheries management Otolith Shape analysis Microsatellites OTOLITH SHAPE-ANALYSIS NORTH-ATLANTIC STOCK MARINUS DISCRIMINATION SEPARATION SIZE COD AGE Christensen, Helle Torp Riget, Frank Backea, Marie Balslev Saha, Atal Johansen, Torild Hedeholm, Rasmus B. Comparison of three methods for identification of redfish ( Sebastes mentella and S. norvegicus ) from the Greenland east coast |
topic_facet |
Species separation Fisheries management Otolith Shape analysis Microsatellites OTOLITH SHAPE-ANALYSIS NORTH-ATLANTIC STOCK MARINUS DISCRIMINATION SEPARATION SIZE COD AGE |
description |
In management of fisheries, knowledge about the species is crucial due to differences in life history traits. The first step is therefore species identification. For many species this task is straightforward, however for some species e.g. the two species of Atlantic redfish Sebastes mentella and Sebastes norvegicus, it can be difficult for an untrained eye. With the goal to separate the two species, we analysed otolith shape variation of S. mentella and S. norvegicus caught on the continental slope of East Greenland using the R package "Shape R". Results were evaluated against genetic analysis of the same fish, and compared to results of both a visual identification of the two species and a separation based on a linear discriminant analysis on standardised values of fish length, fish weight and otolith weight. It was concluded that the objective otolith shape analysis using the Shape R package analysis achieve a reasonable classification success, however with a clear bias towards S. mentella. Classification using the otolith weight achieved a slightly higher success than the shape analysis making it a promising method. Furthermore, the method is at the same time both objective, less time consuming than the otolith shape analysis and less expensive than genetic analysis. However, the visual classification method of the whole fish had the highest success rate of the three tested methods, which despite the need for trained technicians makes it the most successful method. |
format |
Article in Journal/Newspaper |
author |
Christensen, Helle Torp Riget, Frank Backea, Marie Balslev Saha, Atal Johansen, Torild Hedeholm, Rasmus B. |
author_facet |
Christensen, Helle Torp Riget, Frank Backea, Marie Balslev Saha, Atal Johansen, Torild Hedeholm, Rasmus B. |
author_sort |
Christensen, Helle Torp |
title |
Comparison of three methods for identification of redfish ( Sebastes mentella and S. norvegicus ) from the Greenland east coast |
title_short |
Comparison of three methods for identification of redfish ( Sebastes mentella and S. norvegicus ) from the Greenland east coast |
title_full |
Comparison of three methods for identification of redfish ( Sebastes mentella and S. norvegicus ) from the Greenland east coast |
title_fullStr |
Comparison of three methods for identification of redfish ( Sebastes mentella and S. norvegicus ) from the Greenland east coast |
title_full_unstemmed |
Comparison of three methods for identification of redfish ( Sebastes mentella and S. norvegicus ) from the Greenland east coast |
title_sort |
comparison of three methods for identification of redfish ( sebastes mentella and s. norvegicus ) from the greenland east coast |
publishDate |
2018 |
url |
https://pure.au.dk/portal/en/publications/c49f9159-e0b3-4cfe-bfec-5011cfeb3353 https://doi.org/10.1016/j.fishres.2018.01.003 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Atlantic redfish East Greenland Greenland North Atlantic Sebastes mentella Sebastes norvegicus |
genre_facet |
Atlantic redfish East Greenland Greenland North Atlantic Sebastes mentella Sebastes norvegicus |
op_source |
Christensen , H T , Riget , F , Backea , M B , Saha , A , Johansen , T & Hedeholm , R B 2018 , ' Comparison of three methods for identification of redfish ( Sebastes mentella and S. norvegicus ) from the Greenland east coast ' , Fisheries Research , vol. 201 , pp. 11-17 . https://doi.org/10.1016/j.fishres.2018.01.003 |
op_relation |
https://pure.au.dk/portal/en/publications/c49f9159-e0b3-4cfe-bfec-5011cfeb3353 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.fishres.2018.01.003 |
container_title |
Fisheries Research |
container_volume |
201 |
container_start_page |
11 |
op_container_end_page |
17 |
_version_ |
1790597901006667776 |