Estimating Fmsy from an ensemble of data sources to account for density dependence in Northeast Atlantic fish stocks
A new approach for estimating the fishing mortality benchmark Fmsy (fishing pressure that corresponds to maximum sustainable yield) is proposed. The approach includes density-dependent factors. The analysis considers 53 data-rich fish stocks in the Northeast Atlantic. The new Fmsy values are estimat...
Published in: | ICES Journal of Marine Science |
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Main Authors: | , , , , , , , , , , , , |
Format: | Text |
Language: | unknown |
Published: |
DigitalCommons@URI
2021
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Subjects: | |
Online Access: | https://digitalcommons.uri.edu/gsofacpubs/898 https://doi.org/10.1093/icesjms/fsaa175 |
Summary: | A new approach for estimating the fishing mortality benchmark Fmsy (fishing pressure that corresponds to maximum sustainable yield) is proposed. The approach includes density-dependent factors. The analysis considers 53 data-rich fish stocks in the Northeast Atlantic. The new Fmsy values are estimated from an ensemble of data sources: (i) applying traditional surplus production models on time-series of historic stock sizes, fishing mortalities, and catches from the current annual assessments; (ii) dynamic pool model (e.g. age-structured models) estimation for stocks where data on density-dependent growth, maturity, and mortality are available; (iii) extracts from multispecies and ecosystem literature for stocks where well-tested estimates are available; (iv) the "Great Experiment"where fishing pressure on the demersal stocks in the Northeast Atlantic slowly increased for half a century; and (v) linking Fmsy to life history parameters. The new Fmsy values are substantially higher (average equal to 0.38 year-1) than the current Fmsy values (average equal to 0.26 year-1) estimated in stock assessments and used by management, similar to the fishing pressure in the 1960s, and about 30% lower than the fishing pressure in 1970-2000. |
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