Natural mortality estimations for beaked redfish (Sebastes mentella) – A long-lived ovoviviparous species of the Northeast Arctic
Beaked redfish (Sebastes mentella) is one of the few commercially important fish species producing living offspring. Like many other deep-water fishes, it is slow growing, late maturing and long-lived, getting as old as 65 years or even 75 years in some populations. The stock in the Norwegian and Ba...
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Online Access: | https://hdl.handle.net/11250/3111679 https://doi.org/10.1016/j.fishres.2022.106581 |
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ftimr:oai:imr.brage.unit.no:11250/3111679 2024-02-11T10:01:33+01:00 Natural mortality estimations for beaked redfish (Sebastes mentella) – A long-lived ovoviviparous species of the Northeast Arctic Höffle, Hannes Planque, Benjamin 2023 application/pdf https://hdl.handle.net/11250/3111679 https://doi.org/10.1016/j.fishres.2022.106581 eng eng Fisheries Research. 2023, 260 . urn:issn:0165-7836 https://hdl.handle.net/11250/3111679 https://doi.org/10.1016/j.fishres.2022.106581 cristin:2137690 8 260 Fisheries Research Peer reviewed Journal article 2023 ftimr https://doi.org/10.1016/j.fishres.2022.106581 2024-01-17T23:47:42Z Beaked redfish (Sebastes mentella) is one of the few commercially important fish species producing living offspring. Like many other deep-water fishes, it is slow growing, late maturing and long-lived, getting as old as 65 years or even 75 years in some populations. The stock in the Norwegian and Barents Seas is analytically assessed since 2012, assuming a natural mortality (M) of 0.05 yr−1 across all ages, based on Hoenig’s longevity related estimator. Since then, several reviews and new studies have been published, affording a re-evaluation of the natural mortality in the assessment model. We estimated natural mortality of beaked redfish using 48 different estimators in two categories, either estimating M across the population or dependent on age, length or weight. The obtained estimates were highly variable, ranging from 0.01 to 0.32 yr−1 for estimates across the population, and 0.05–0.62 yr−1 for age or size dependent median-M. These wide ranges demonstrate the sensitivity of SSB to the input parameters as well as the pitfalls of using estimators developed for distant taxa. Of the 48 estimates, 20 were considered as potential candidates for updating the stock assessment model, yet not all of these were realistic. The frequency distribution of the estimators showed a peak around a value of 0.07 yr−1, lowering the estimated spawning stock biomass in the last year by about 300 kt but keeping it above the precautionary reference point for the stock. Estimators across the life-history of beaked redfish indicate a potential underestimation of natural mortality for early and overestimation for late age classes. Age and size related estimators are promising for the older ages but tend to extreme estimates for the early ages, which deserves further investigation. acceptedVersion Article in Journal/Newspaper Arctic Sebastes mentella Institute for Marine Research: Brage IMR Arctic Fisheries Research 260 106581 |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
description |
Beaked redfish (Sebastes mentella) is one of the few commercially important fish species producing living offspring. Like many other deep-water fishes, it is slow growing, late maturing and long-lived, getting as old as 65 years or even 75 years in some populations. The stock in the Norwegian and Barents Seas is analytically assessed since 2012, assuming a natural mortality (M) of 0.05 yr−1 across all ages, based on Hoenig’s longevity related estimator. Since then, several reviews and new studies have been published, affording a re-evaluation of the natural mortality in the assessment model. We estimated natural mortality of beaked redfish using 48 different estimators in two categories, either estimating M across the population or dependent on age, length or weight. The obtained estimates were highly variable, ranging from 0.01 to 0.32 yr−1 for estimates across the population, and 0.05–0.62 yr−1 for age or size dependent median-M. These wide ranges demonstrate the sensitivity of SSB to the input parameters as well as the pitfalls of using estimators developed for distant taxa. Of the 48 estimates, 20 were considered as potential candidates for updating the stock assessment model, yet not all of these were realistic. The frequency distribution of the estimators showed a peak around a value of 0.07 yr−1, lowering the estimated spawning stock biomass in the last year by about 300 kt but keeping it above the precautionary reference point for the stock. Estimators across the life-history of beaked redfish indicate a potential underestimation of natural mortality for early and overestimation for late age classes. Age and size related estimators are promising for the older ages but tend to extreme estimates for the early ages, which deserves further investigation. acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Höffle, Hannes Planque, Benjamin |
spellingShingle |
Höffle, Hannes Planque, Benjamin Natural mortality estimations for beaked redfish (Sebastes mentella) – A long-lived ovoviviparous species of the Northeast Arctic |
author_facet |
Höffle, Hannes Planque, Benjamin |
author_sort |
Höffle, Hannes |
title |
Natural mortality estimations for beaked redfish (Sebastes mentella) – A long-lived ovoviviparous species of the Northeast Arctic |
title_short |
Natural mortality estimations for beaked redfish (Sebastes mentella) – A long-lived ovoviviparous species of the Northeast Arctic |
title_full |
Natural mortality estimations for beaked redfish (Sebastes mentella) – A long-lived ovoviviparous species of the Northeast Arctic |
title_fullStr |
Natural mortality estimations for beaked redfish (Sebastes mentella) – A long-lived ovoviviparous species of the Northeast Arctic |
title_full_unstemmed |
Natural mortality estimations for beaked redfish (Sebastes mentella) – A long-lived ovoviviparous species of the Northeast Arctic |
title_sort |
natural mortality estimations for beaked redfish (sebastes mentella) – a long-lived ovoviviparous species of the northeast arctic |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3111679 https://doi.org/10.1016/j.fishres.2022.106581 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sebastes mentella |
genre_facet |
Arctic Sebastes mentella |
op_source |
8 260 Fisheries Research |
op_relation |
Fisheries Research. 2023, 260 . urn:issn:0165-7836 https://hdl.handle.net/11250/3111679 https://doi.org/10.1016/j.fishres.2022.106581 cristin:2137690 |
op_doi |
https://doi.org/10.1016/j.fishres.2022.106581 |
container_title |
Fisheries Research |
container_volume |
260 |
container_start_page |
106581 |
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1790597355358126080 |