Temporal and environmental variation in growth and maturity and effects on management reference points of Georges Bank Atlantic cod

Miller, Timothy J.; O’Brien, Loretta; Fratantoni, Paula S.

doi:10.1139/cjfas-2017-0124

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Temporal and environmental variation in growth and maturity and effects on management reference points of Georges Bank Atlantic cod

2018
By Miller, Timothy J. ; O’Brien, Loretta ; Fratantoni, Paula S.
Source: Canadian Journal of Fisheries and Aquatic Sciences, 75(12), 2159-2171

[PDF-2.76 MB]

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Journal Title:

Canadian Journal of Fisheries and Aquatic Sciences
Personal Author:

Miller, Timothy J. ; O’Brien, Loretta ; Fratantoni, Paula S.

Miller, Timothy J. ; O’Brien, Loretta ; Fratantoni, Paula 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:

Temporal variation in demographic rates has been observed in various fish populations and environmental influences are likely to be a key factor. Here we show how it can be important to combine state-space models for environmental covariates and demographic rates when evaluating effects of the former on the latter. In an application to Georges Bank Atlantic cod (Gadus morhua), we show how estimates of the environmental covariate can be aliased with unknown temporal variation in growth rates and that stronger and opposite effects of the environment can incorrectly be found when the autocorrelation in the growth rate is not separately modeled. The perception of effects on maturity also depends on whether an appropriate distribution is considered for the maturity observations. Bottom temperature did not improve prediction of maturity parameters, but temporal variation driven by other sources did. Both bottom temperature and temporal variation improved performance of growth models. Finally, we found growth and maturity estimation to be important contributors to uncertainty of spawning biomass and biological reference points when incorporated into a state-space assessment model.
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Canadian Journal of Fisheries and Aquatic Sciences, 75(12), 2159-2171
DOI:

https://doi.org/10.1139/cjfas-2017-0124
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0706-652X;1205-7533;
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pdf
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Canadian Science Publishing
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Journal Article
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urn:sha-512:da95a82f187b825259b3c2ae928dc5bfd70390db9dbc8a165ddbd81209e8a218b283d646b29cfca92606f4f231fd6e261d8c31000dd1a1a0741eb1004923917c
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Temporal and environmental variation in growth and maturity and effects on management reference points of Georges Bank Atlantic cod

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