Age, Growth, and Natural Mortality of Graysby, Cephalophilis cruentata, from the Southeastern United States

Burton, M. L.; Potts, J. C.; Ostrowski, A. D.; Shertzer, K. W.

doi:10.3390/fishes403003

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i

Age, Growth, and Natural Mortality of Graysby, Cephalophilis cruentata, from the Southeastern United States

2019
By Burton, M. L. ; Potts, J. C. ; Ostrowski, A. D. ; ...
Source: Fishes, 4(3), 36.

[PDF-2.64 MB]

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Journal Title:

Fishes
Personal Author:

Burton, M. L. ; Potts, J. C. ; Ostrowski, A. D. ; Shertzer, K. W.

Burton, M. L. ; Potts, J. C. ; Ostrowski, A. D. ; Shertzer, K. W. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SEFSC (Southeast Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; SEFSC (Southeast Fisheries Science Center) Less -
Description:

Graysby (Cephalophilis cruentata) (n = 1308) collected from the southeastern United States Atlantic coast from 2001 to 2016 were aged using sectioned sagittal otoliths. Opaque zones formed February to June (peaking in April). Ages ranged from 2 to 21 years, and the largest fish measured 453 mm TL. Growth morph analysis revealed two regionally distinct growth trajectories: von Bertalanffy growth equations were Lt = 388 (1 − e−0.12(t+5.73)) for fish from North Carolina through southeast Florida (northern region), and Lt = 267 (1 − e−0.17(t+6.20)) for fish from the Florida Keys (southern region). When growth was re-estimated using a fixed t0 value of −0.75 to estimate for smaller fish, growth equations were Lt = 349 (1 − e−0.26(t+0.75)) and Lt = 250 (1 − e−0.43(t+0.75)) for fish from the northern and southern regions, respectively. The age-invariant estimate of natural mortality was M = 0.30 for all fish, while age-specific estimates ranged 0.88–0.28 y−1 for fish aged 1–21 from the northern region and 0.89–0.47 y−1 for fish aged 1–15 from the southern region. This study presents the first comprehensive analysis of life-history parameters for graysby from the Atlantic waters off the southeastern United States, including specimens from both recreational and commercial fisheries.
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Age Cephalophilis Cruentata Graysby Growth
Source:

Fishes, 4(3), 36.
DOI:

http://dx.doi.org/10.3390/fishes403003
Document Type:

Journal Article
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CC BY
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Submitted
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urn:sha256:39d091d8da91997d248cebee7ffbd12b16184279c4cfe357e34825be34cddaa0
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https://repository.library.noaa.gov/view/noaa/20741/noaa_20741_DS1.pdf
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Age, Growth, and Natural Mortality of Graysby, Cephalophilis cruentata, from the Southeastern United States

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