Effects of unequal capture probability on stock assessment abundance and mortality estimates: an example using the US Atlantic sea scallop fishery

Truesdell, Samuel B.; Hart, Deborah R.; Chen, Yong

doi:10.1139/cjfas-2016-0296

i

Effects of unequal capture probability on stock assessment abundance and mortality estimates: an example using the US Atlantic sea scallop fishery

2017
By Truesdell, Samuel B. ; Hart, Deborah R. ; Chen, Yong

Details

Journal Title:

Canadian Journal of Fisheries and Aquatic Sciences
Personal Author:

Truesdell, Samuel B. ; Hart, Deborah R. ; Chen, Yong
NOAA Program & Office:

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

Most stock assessment models assume that the probability of capture for all individuals of the same size or age in the stock area is equal. However, this assumption is rarely, if ever, satisfied. We used spatially referenced simulations, based on the US Atlantic sea scallop (Placopecten magellanicus) fishery, to generate catch, survey index, fishing effort, and size structure data that we input into a (nonspatial) catch-at-size stock assessment model to estimate abundance and mortality rates. We show that spatial patterns in fishing mortality degrade model performance for sessile stocks. Fishing mortality tended to be overestimated and abundance underestimated because trends in fishing mortality were exaggerated and the model misestimated the numbers of larger individuals due to spatial fishing patterns. These results are particularly relevant to sedentary species such as scallops, but are applicable wherever strong spatial patterns exist in fishing mortality.
Keywords:

Aquatic Science Ecology, Evolution, Behavior And Systematics Ecology, Evolution, Behavior And Systematics Ecology, Evolution, Behavior And Systematics
Source:

Canadian Journal of Fisheries and Aquatic Sciences, 74(11), 1904-1917
DOI:

https://doi.org/10.1139/cjfas-2016-0296
ISSN:

0706-652X ; 1205-7533
Format:

PDF
Publisher:

Canadian Science Publishing
Document Type:

Journal Article
Rights Information:

Other
Compliance:

Library
Main Document Checksum:

urn:sha-512:610acc380f6d80aa7a3db708cdd52aff7d607824b825902ccd5e59e2f3c44fff21e9ed30f59d0539cd5db1f2d22833c7f0175f0266b6619385c2313c85c84ca5
Download URL:

https://repository.library.noaa.gov/view/noaa/54906/noaa_54906_DS1.pdf
File Type:

[PDF - 1.45 MB ]

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