In what direction should the fishing mortality target change when natural mortality increases within an assessment?

Legault, Christopher M.; Palmer, Michael C.

doi:10.1139/cjfas-2015-0232

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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

In what direction should the fishing mortality target change when natural mortality increases within an assessment?

2016
By Legault, Christopher M. ; Palmer, Michael C.
Source: Canadian Journal of Fisheries and Aquatic Sciences, 73(3), 349-357

[PDF-1.29 MB]

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Journal Title:

Canadian Journal of Fisheries and Aquatic Sciences
Personal Author:

Legault, Christopher M. ; Palmer, Michael C.

Legault, Christopher M. ; Palmer, Michael C. Less -
NOAA Program & Office:

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

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

Traditionally, the natural mortality rate (M) in a stock assessment is assumed to be constant. When M increases within an assessment, the question arises how to change the fishing mortality rate target (FTarget). Per recruit considerations lead to an increase in FTarget, while limiting total mortality leads to a decrease in FTarget. Application of either approach can result in nonsensical results. Short-term gains in yield associated with high FTarget values should be considered in light of potential losses in future yield if the high total mortality rate leads to a decrease in recruitment. Examples using yellowtail flounder (Limanda ferruginea) and Atlantic cod (Gadus morhua) are used to demonstrate that FTarget can change when M increases within an assessment and to illustrate the consequences of different FTarget values. When a change in M within an assessment is contemplated, first consider the amount and strength of empirical evidence to support the change. When the empirical evidence is not strong, we recommend using a constant M. If strong empirical evidence exists, we recommend estimating FTarget for a range of stock–recruitment relationships and evaluating the trade-offs between risk of overfishing and forgone yield.
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Aquatic Science Ecology, Evolution, Behavior And Systematics
Source:

Canadian Journal of Fisheries and Aquatic Sciences, 73(3), 349-357
DOI:

https://doi.org/10.1139/cjfas-2015-0232
ISSN:

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-512:3ef45e312a247d19d15f39aa4c90bbac78334dc4a996799f459b28932d49e2f8383bb5dea8b38ad1132fc88f2f6fdbdcacb880b3b4f419b42be150cd3fddbf25
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In what direction should the fishing mortality target change when natural mortality increases within an assessment?

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