An Integrated, Size-Structured Stock Assessment of Antarctic Krill, Euphausia superba

The Antarctic krill (Euphausia superba) fishery is the largest fishery in the Southern Ocean, and it has been operating for over 45 years. In the past decade, the spatial distribution of the krill fishery has focused on the Bransfield Strait off the Antarctic Peninsula (subarea 48.1). However, the h...

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Autores principales:	Rui Wang, Puqing Song, Yuan Li, Longshan Lin
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	Antarctic krill integrated size-structured model stock assessment Antarctic Peninsula data weighting climate change Science Q General. Including nature conservation, geographical distribution QH1-199.5
Acceso en línea:	https://doaj.org/article/82607a9331ba4be4a11e1f32f729deeb
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spelling	oai:doaj.org-article:82607a9331ba4be4a11e1f32f729deeb2021-11-09T11:30:17ZAn Integrated, Size-Structured Stock Assessment of Antarctic Krill, Euphausia superba2296-774510.3389/fmars.2021.710544https://doaj.org/article/82607a9331ba4be4a11e1f32f729deeb2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmars.2021.710544/fullhttps://doaj.org/toc/2296-7745The Antarctic krill (Euphausia superba) fishery is the largest fishery in the Southern Ocean, and it has been operating for over 45 years. In the past decade, the spatial distribution of the krill fishery has focused on the Bransfield Strait off the Antarctic Peninsula (subarea 48.1). However, the high fishing effort and climate change have placed great pressure on krill resources in this region, and conservation concerns have been raised. Because aging krill is difficult and uncertain, we developed an integrated size-structured model to estimate the fishing mortality, recruitment and spawning biomass of krill. The results indicated that in 1992–2011, the average spawning biomass of krill ranged from 1.14 × 106 to 1.45 × 106 tons, the estimated biomass of the maximum sustainable yield (BMSY) ranged from 3.96 × 105 to 4.90 × 105 tons and the estimated average recruitment ranged from 2.3 × 1012 to 5.03 × 1012 individuals in the research area. We explored the effect of different data weighting schemes for the length data on the assessment output. However, our estimates also have uncertainties. In addition, an attempt was made to analyze the correlation between model-estimated recruitment and mature biomass with climate change. Future stock assessments of krill resources should be comprehensive and multimethod, and the management of krill resources should be based on science that considers the demand of fishing communities and ecosystem protection.Rui WangPuqing SongYuan LiLongshan LinFrontiers Media S.A.articleAntarctic krillintegrated size-structured modelstock assessmentAntarctic Peninsuladata weightingclimate changeScienceQGeneral. Including nature conservation, geographical distributionQH1-199.5ENFrontiers in Marine Science, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Antarctic krill integrated size-structured model stock assessment Antarctic Peninsula data weighting climate change Science Q General. Including nature conservation, geographical distribution QH1-199.5
spellingShingle	Antarctic krill integrated size-structured model stock assessment Antarctic Peninsula data weighting climate change Science Q General. Including nature conservation, geographical distribution QH1-199.5 Rui Wang Puqing Song Yuan Li Longshan Lin An Integrated, Size-Structured Stock Assessment of Antarctic Krill, Euphausia superba
description	The Antarctic krill (Euphausia superba) fishery is the largest fishery in the Southern Ocean, and it has been operating for over 45 years. In the past decade, the spatial distribution of the krill fishery has focused on the Bransfield Strait off the Antarctic Peninsula (subarea 48.1). However, the high fishing effort and climate change have placed great pressure on krill resources in this region, and conservation concerns have been raised. Because aging krill is difficult and uncertain, we developed an integrated size-structured model to estimate the fishing mortality, recruitment and spawning biomass of krill. The results indicated that in 1992–2011, the average spawning biomass of krill ranged from 1.14 × 106 to 1.45 × 106 tons, the estimated biomass of the maximum sustainable yield (BMSY) ranged from 3.96 × 105 to 4.90 × 105 tons and the estimated average recruitment ranged from 2.3 × 1012 to 5.03 × 1012 individuals in the research area. We explored the effect of different data weighting schemes for the length data on the assessment output. However, our estimates also have uncertainties. In addition, an attempt was made to analyze the correlation between model-estimated recruitment and mature biomass with climate change. Future stock assessments of krill resources should be comprehensive and multimethod, and the management of krill resources should be based on science that considers the demand of fishing communities and ecosystem protection.
format	article
author	Rui Wang Puqing Song Yuan Li Longshan Lin
author_facet	Rui Wang Puqing Song Yuan Li Longshan Lin
author_sort	Rui Wang
title	An Integrated, Size-Structured Stock Assessment of Antarctic Krill, Euphausia superba
title_short	An Integrated, Size-Structured Stock Assessment of Antarctic Krill, Euphausia superba
title_full	An Integrated, Size-Structured Stock Assessment of Antarctic Krill, Euphausia superba
title_fullStr	An Integrated, Size-Structured Stock Assessment of Antarctic Krill, Euphausia superba
title_full_unstemmed	An Integrated, Size-Structured Stock Assessment of Antarctic Krill, Euphausia superba
title_sort	integrated, size-structured stock assessment of antarctic krill, euphausia superba
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/82607a9331ba4be4a11e1f32f729deeb
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An Integrated, Size-Structured Stock Assessment of Antarctic Krill, Euphausia superba

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