Size-based estimation of the status of fish stocks: simulation analysis and comparison with age-based estimations

Research output: Contribution to conferenceConference abstract for conferenceResearch

Abstract

Estimation of the status of fish stocks is important for sustainable management. Data limitations and data quality hinder this task. The commonly used age-based approaches require information about individual age, which is costly and relatively inaccurate. In contrast, the size of organisms is linked to physiology more directly than is age, and can be measured easier with less cost. In this work we used a single-species size-based model to estimate the fishing mortality (F) and the status of the stock, quantified by the ratio F/Fmsy between actual fishing mortality and the fishing mortality which leads to the maximum sustainable yield. A simulation analysis was done to investigate the sensitivity of the estimation and its improvement when stock specific life history information is available. To evaluate our approach with real observations, data-rich fish stocks, like the North Sea cod, were investigated and our estimations were compared to the ICES advice. Only size-specific catch data were used, in order to emulate data limited situations. The simulation analysis reveals that the status of the stock, i.e. F/Fmsy, is estimated more accurately than the fishing mortality F itself. Specific knowledge of the natural mortality improves the estimation more than having information about all other life history parameters. Our approach gives, at least qualitatively, an estimated stock status which is similar to the results of an age-based assessment. Since our approach only uses size-based catch data, it is a suitable tool for data-limited situations
Original languageEnglish
Publication date2013
Publication statusPublished - 2013
EventICES Annual Science Conference 2013 - Harpa Concert Hall and Conference Centre, Reykjavik, Iceland
Duration: 23 Sep 201327 Sep 2013

Conference

ConferenceICES Annual Science Conference 2013
LocationHarpa Concert Hall and Conference Centre
CountryIceland
CityReykjavik
Period23/09/201327/09/2013

Bibliographical note

ICES ASC 2013 extended abstract - ICES CM H:16

Cite this

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title = "Size-based estimation of the status of fish stocks: simulation analysis and comparison with age-based estimations",
abstract = "Estimation of the status of fish stocks is important for sustainable management. Data limitations and data quality hinder this task. The commonly used age-based approaches require information about individual age, which is costly and relatively inaccurate. In contrast, the size of organisms is linked to physiology more directly than is age, and can be measured easier with less cost. In this work we used a single-species size-based model to estimate the fishing mortality (F) and the status of the stock, quantified by the ratio F/Fmsy between actual fishing mortality and the fishing mortality which leads to the maximum sustainable yield. A simulation analysis was done to investigate the sensitivity of the estimation and its improvement when stock specific life history information is available. To evaluate our approach with real observations, data-rich fish stocks, like the North Sea cod, were investigated and our estimations were compared to the ICES advice. Only size-specific catch data were used, in order to emulate data limited situations. The simulation analysis reveals that the status of the stock, i.e. F/Fmsy, is estimated more accurately than the fishing mortality F itself. Specific knowledge of the natural mortality improves the estimation more than having information about all other life history parameters. Our approach gives, at least qualitatively, an estimated stock status which is similar to the results of an age-based assessment. Since our approach only uses size-based catch data, it is a suitable tool for data-limited situations",
author = "Alexandros Kokkalis and Thygesen, {Uffe H{\o}gsbro} and Anders Nielsen and Andersen, {Ken Haste}",
note = "ICES ASC 2013 extended abstract - ICES CM H:16 ; ICES Annual Science Conference 2013 ; Conference date: 23-09-2013 Through 27-09-2013",
year = "2013",
language = "English",

}

Size-based estimation of the status of fish stocks: simulation analysis and comparison with age-based estimations. / Kokkalis, Alexandros; Thygesen, Uffe Høgsbro; Nielsen, Anders; Andersen, Ken Haste.

2013. Abstract from ICES Annual Science Conference 2013, Reykjavik, Iceland.

Research output: Contribution to conferenceConference abstract for conferenceResearch

TY - ABST

T1 - Size-based estimation of the status of fish stocks: simulation analysis and comparison with age-based estimations

AU - Kokkalis, Alexandros

AU - Thygesen, Uffe Høgsbro

AU - Nielsen, Anders

AU - Andersen, Ken Haste

N1 - ICES ASC 2013 extended abstract - ICES CM H:16

PY - 2013

Y1 - 2013

N2 - Estimation of the status of fish stocks is important for sustainable management. Data limitations and data quality hinder this task. The commonly used age-based approaches require information about individual age, which is costly and relatively inaccurate. In contrast, the size of organisms is linked to physiology more directly than is age, and can be measured easier with less cost. In this work we used a single-species size-based model to estimate the fishing mortality (F) and the status of the stock, quantified by the ratio F/Fmsy between actual fishing mortality and the fishing mortality which leads to the maximum sustainable yield. A simulation analysis was done to investigate the sensitivity of the estimation and its improvement when stock specific life history information is available. To evaluate our approach with real observations, data-rich fish stocks, like the North Sea cod, were investigated and our estimations were compared to the ICES advice. Only size-specific catch data were used, in order to emulate data limited situations. The simulation analysis reveals that the status of the stock, i.e. F/Fmsy, is estimated more accurately than the fishing mortality F itself. Specific knowledge of the natural mortality improves the estimation more than having information about all other life history parameters. Our approach gives, at least qualitatively, an estimated stock status which is similar to the results of an age-based assessment. Since our approach only uses size-based catch data, it is a suitable tool for data-limited situations

AB - Estimation of the status of fish stocks is important for sustainable management. Data limitations and data quality hinder this task. The commonly used age-based approaches require information about individual age, which is costly and relatively inaccurate. In contrast, the size of organisms is linked to physiology more directly than is age, and can be measured easier with less cost. In this work we used a single-species size-based model to estimate the fishing mortality (F) and the status of the stock, quantified by the ratio F/Fmsy between actual fishing mortality and the fishing mortality which leads to the maximum sustainable yield. A simulation analysis was done to investigate the sensitivity of the estimation and its improvement when stock specific life history information is available. To evaluate our approach with real observations, data-rich fish stocks, like the North Sea cod, were investigated and our estimations were compared to the ICES advice. Only size-specific catch data were used, in order to emulate data limited situations. The simulation analysis reveals that the status of the stock, i.e. F/Fmsy, is estimated more accurately than the fishing mortality F itself. Specific knowledge of the natural mortality improves the estimation more than having information about all other life history parameters. Our approach gives, at least qualitatively, an estimated stock status which is similar to the results of an age-based assessment. Since our approach only uses size-based catch data, it is a suitable tool for data-limited situations

M3 - Conference abstract for conference

ER -