The precision of international market sampling for North Sea herring and its influence on assessment

E.J. Simmonds, C.L. Needle, H. Degel, S. Flatman, C.M. O'Brien, M.A. Pastoors

    Research output: Chapter in Book/Report/Conference proceedingConference paper

    Abstract

    Market sampling is a key source of data for catch-at-age-based assessment. Little has been documented about the influence of potential error in these data on the precision of assessments and the management information they produce. This paper presents the results of a study of the precision of North Sea herring fish market sampling carried out by the UK, Denmark and the Netherlands. Data from eight years of market sampling were analysed to obtain the precision of estimated numbers-at-age in the catch. The market sample data was then used to estimate 1000 realisations of the international catch-at-age and mean weightsat- age in the catch. Three methods of estimating the variability of missing catch data were used and three options for the catch-at-age matrices were computed. These base datasets were utilised to obtain 1000 assessments conditional on the ICA (Integrated Catch-at-age Analysis) model. From the outcome of these assessments the influence of the market sampling programmes on the management of the stock are presented as 95␌onfidence intervals on the main management parameters (recruitment, SSB, F0-1 and F2-6). In addition, the influence of missing data is estimated. The implications of our conclusions on the requirements from a market sampling programme are discussed
    Original languageEnglish
    Title of host publicationInternational Council Exploration of the Sea Council Meeting 2001/P:21 (2001)
    Pages1
    Publication statusPublished - 2001

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    market
    sampling
    catch statistics
    information management
    sea
    matrix
    fish
    programme

    Cite this

    Simmonds, E. J., Needle, C. L., Degel, H., Flatman, S., O'Brien, C. M., & Pastoors, M. A. (2001). The precision of international market sampling for North Sea herring and its influence on assessment. In International Council Exploration of the Sea Council Meeting 2001/P:21 (2001) (pp. 1)
    Simmonds, E.J. ; Needle, C.L. ; Degel, H. ; Flatman, S. ; O'Brien, C.M. ; Pastoors, M.A. / The precision of international market sampling for North Sea herring and its influence on assessment. International Council Exploration of the Sea Council Meeting 2001/P:21 (2001). 2001. pp. 1
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    abstract = "Market sampling is a key source of data for catch-at-age-based assessment. Little has been documented about the influence of potential error in these data on the precision of assessments and the management information they produce. This paper presents the results of a study of the precision of North Sea herring fish market sampling carried out by the UK, Denmark and the Netherlands. Data from eight years of market sampling were analysed to obtain the precision of estimated numbers-at-age in the catch. The market sample data was then used to estimate 1000 realisations of the international catch-at-age and mean weightsat- age in the catch. Three methods of estimating the variability of missing catch data were used and three options for the catch-at-age matrices were computed. These base datasets were utilised to obtain 1000 assessments conditional on the ICA (Integrated Catch-at-age Analysis) model. From the outcome of these assessments the influence of the market sampling programmes on the management of the stock are presented as 95␌onfidence intervals on the main management parameters (recruitment, SSB, F0-1 and F2-6). In addition, the influence of missing data is estimated. The implications of our conclusions on the requirements from a market sampling programme are discussed",
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    Simmonds, EJ, Needle, CL, Degel, H, Flatman, S, O'Brien, CM & Pastoors, MA 2001, The precision of international market sampling for North Sea herring and its influence on assessment. in International Council Exploration of the Sea Council Meeting 2001/P:21 (2001). pp. 1.

    The precision of international market sampling for North Sea herring and its influence on assessment. / Simmonds, E.J.; Needle, C.L.; Degel, H.; Flatman, S.; O'Brien, C.M.; Pastoors, M.A.

    International Council Exploration of the Sea Council Meeting 2001/P:21 (2001). 2001. p. 1.

    Research output: Chapter in Book/Report/Conference proceedingConference paper

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    T1 - The precision of international market sampling for North Sea herring and its influence on assessment

    AU - Simmonds, E.J.

    AU - Needle, C.L.

    AU - Degel, H.

    AU - Flatman, S.

    AU - O'Brien, C.M.

    AU - Pastoors, M.A.

    PY - 2001

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    N2 - Market sampling is a key source of data for catch-at-age-based assessment. Little has been documented about the influence of potential error in these data on the precision of assessments and the management information they produce. This paper presents the results of a study of the precision of North Sea herring fish market sampling carried out by the UK, Denmark and the Netherlands. Data from eight years of market sampling were analysed to obtain the precision of estimated numbers-at-age in the catch. The market sample data was then used to estimate 1000 realisations of the international catch-at-age and mean weightsat- age in the catch. Three methods of estimating the variability of missing catch data were used and three options for the catch-at-age matrices were computed. These base datasets were utilised to obtain 1000 assessments conditional on the ICA (Integrated Catch-at-age Analysis) model. From the outcome of these assessments the influence of the market sampling programmes on the management of the stock are presented as 95␌onfidence intervals on the main management parameters (recruitment, SSB, F0-1 and F2-6). In addition, the influence of missing data is estimated. The implications of our conclusions on the requirements from a market sampling programme are discussed

    AB - Market sampling is a key source of data for catch-at-age-based assessment. Little has been documented about the influence of potential error in these data on the precision of assessments and the management information they produce. This paper presents the results of a study of the precision of North Sea herring fish market sampling carried out by the UK, Denmark and the Netherlands. Data from eight years of market sampling were analysed to obtain the precision of estimated numbers-at-age in the catch. The market sample data was then used to estimate 1000 realisations of the international catch-at-age and mean weightsat- age in the catch. Three methods of estimating the variability of missing catch data were used and three options for the catch-at-age matrices were computed. These base datasets were utilised to obtain 1000 assessments conditional on the ICA (Integrated Catch-at-age Analysis) model. From the outcome of these assessments the influence of the market sampling programmes on the management of the stock are presented as 95␌onfidence intervals on the main management parameters (recruitment, SSB, F0-1 and F2-6). In addition, the influence of missing data is estimated. The implications of our conclusions on the requirements from a market sampling programme are discussed

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    BT - International Council Exploration of the Sea Council Meeting 2001/P:21 (2001)

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    Simmonds EJ, Needle CL, Degel H, Flatman S, O'Brien CM, Pastoors MA. The precision of international market sampling for North Sea herring and its influence on assessment. In International Council Exploration of the Sea Council Meeting 2001/P:21 (2001). 2001. p. 1