Application of Some Index Methods to Georges Bank Yellowtail Flounder

Rago, Paul; Legault, Chris

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Application of Some Index Methods to Georges Bank Yellowtail Flounder

2014
By Rago, Paul ; Legault, Chris

[PDF-1.27 MB]

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Personal Author:

Rago, Paul ; Legault, Chris

Rago, Paul ; Legault, Chris Less -
Corporate Authors:

Canada. Department of Fisheries and Oceans ; United States. National Marine Fisheries Service ; Northeast Fisheries Science Center (U.S.)

Canada. Department of Fisheries and Oceans ; United States. National Marine Fisheries Service ; Northeast Fisheries Science Center (U.S.) Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; NEFSC (Northeast Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; NEFSC (Northeast Fisheries Science Center) Less -
Description:

Simple graphical and empirical methods are used to examine the relationships between relative abundance and estimated catch of Georges Bank Yellowtail Flounder for three different synoptic surveys over the period 1963 to 2013. All three surveys reveal similar trends in abundance and relative fishing mortality. Kalman filtered estimates appear to be a useful way of summarizing trends and have strong similarities to model based estimates. Measures of relative fishing mortality increased steadily up through 1994, fell sharply in 1995 and have declined since then. Relative biomass increased rapidly for about 8 to 10 years after the decline in F, but has since declined, despite continued reductions in relative F. The simple model results suggest a change in underlying relationship between abundance and exploitation. While aggregated data used in this analysis are insufficient to identify the underlying cause, the large changes suggest that any model will have diagnostic problems unless an underlying mechanism for the change is incorporated into the model.
Keywords:

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Estimates Evaluation Fish Stock Assessment Limanda Ferruginea Mathematical Models TRAC Transboundary Resource Assessment Committee Reference Document 2014/
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Miscellaneous
Place as Subject:

Georges Bank ; North Atlantic Ocean

Georges Bank ; North Atlantic Ocean Less -
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Public Domain
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Submitted
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urn:sha256:d1736d7b3f08ef63606ff3f26c631fd74569163044f154ef7d6a51f3fa15e350
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https://repository.library.noaa.gov/view/noaa/26474/noaa_26474_DS1.pdf
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Application of Some Index Methods to Georges Bank Yellowtail Flounder

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