Population Characteristics of Gulf Menhaden, Brevoortia patronus

Vaughan, Douglas S. and Levi, Eldon J. and Smith, Joseph W. (1996) Population Characteristics of Gulf Menhaden, Brevoortia patronus. NOAA/National Marine Fisheries Service, (NOAA Technical Report NMFS, 125)

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Abstract

The status of the gulf menhaden, Brevoortia patronus, fishery was assessed with purseseine landing data from 1946 to 1992 and port sampling data from 1964 to 1992. These data were analyzed to determine growth rates, biological reference points for fishing mortality from yield per recruit and maximum spawning potential analyses, spawner-recruit relationships, and maximum sustainable yield (MSY). Virtual population approaches were used to obtain point estimates of stock size, recruits to age I, spawning stock size, and fishing mortality rates. Exploitation rates ranged between 14% and 45% for age-1 fish, between 30% and 72% for age-2 fish, and between 36% and 71% for age-3 fish. Biological reference points from yield per recruit (FO. I: 0.7-0.9 yr-1) and maximum spawning potential (F20: 1.62.9 yr-l and F30: 1.0-2.1 yr-1) were obtained for comparison with recent estimates of F (0.4-0.8 yr-l). Parameters from Ricker-type spawner-recruit relations were estimated, although considerable unexplained variability remained. Estimates of long-term MSY from fits of the generalized production model ranged between 664,000 metric tons (t) and 897,000 t. Declines in landings since 1988 have raised concerns about the status of the gulf menhaden stock. However, gulf menhaden are short lived and highly fecund. Thus, variation in recruitment to age 1 largely mediated by environmental conditions influences fishing success over the next two years (as age-1 and age-2 fish). Comparisons of recent estimates of fishing mortality to biological reference points do not suggest overfishing. (PDF file contains 26 pages.)

Item Type: Monograph or Serial Issue
Title: Population Characteristics of Gulf Menhaden, Brevoortia patronus
Personal Creator/Author:
CreatorsEmail
Vaughan, Douglas S.
Levi, Eldon J.
Smith, Joseph W.
Series Name: NOAA Technical Report NMFS
Number: 125
Date: 1996
Publisher: NOAA/National Marine Fisheries Service
Issuing Agency: United States National Marine Fisheries Service
Subjects: Management
Ecology
Fisheries
Item ID: 2690
Depositing User: Patti M. Marraro
Date Deposited: 31 Oct 2009 19:04
Last Modified: 29 Sep 2011 18:34
URI: http://aquaticcommons.org/id/eprint/2690

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