Population assessment of two stocks of white grunt, Haemulon plumieri, from the southeastern coast of the United States

Potts, Jennifer C. (2000) Population assessment of two stocks of white grunt, Haemulon plumieri, from the southeastern coast of the United States. Beaufort, NC, NOAA/National Marine Fisheries Service/Southeast Fisheries Science Center, (NOAA Technical Memorandum NMFS-SEFSC, 442)

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Abstract

Changes in the age structure and population size of white grunt, Haemulon plumieri, from North Carolina through the Florida Keys were examined using records of landings and size frequencies of fish from commercial, re~reational, and headboat fisheries from 1986-1998. Data were stratified into two geographical areas: North Carolina and South Carolina; and southeast Florida. Population size in numbers at age was estimated for each year and geographical area by applying an uncalibrated separable virtual population analysis (SVPA) to the landings in numbers at age. A calibrated virtual population analysis, FADAPT, was also run for data from North Carolina and South Carolina. SVPA and FADAPT were used to estimate annual, age-specific fishing mortality (F) for four levels of natural mortality (M = 0.20, 0.25, 0.30, and 0.35). The best estimate of M for white grunt is 0.30. Landings of white grunt in the Carolinas for the three fisheries have generally decreased in recent years, but have held fairly steady for the species in southeast Florida. Age at entry and age at full recruitment were age-1 and age-4 for the Carolinas, and age-l and age-3 for southeast Florida. With M = 0.30, levels of fishing mortality (F) on the fully-recruited ages were 0.23 for the Carolinas and 0.33 for southeast Florida. Spawning potential ratio (SPR) at M = 0.30 was 57% for the Carolinas and 61% for southeast Florida, which indicates that the species, by definition, has not been over-exploited by fishing. The results of this assessment of the white grunt population off the Carolinas agree with the recent F/FMSY analysis of white grunt (Anonymous, 1999). (PDF contaons 72 pages)

Item Type: Monograph or Serial Issue
Title: Population assessment of two stocks of white grunt, Haemulon plumieri, from the southeastern coast of the United States
Personal Creator/Author:
CreatorsEmail
Potts, Jennifer C.Jennifer.Potts@noaa.gov
Series Name: NOAA Technical Memorandum NMFS-SEFSC
Number: 442
Date: 2000
Publisher: NOAA/National Marine Fisheries Service/Southeast Fisheries Science Center
Place of Publication: Beaufort, NC
Issuing Agency: United States National Marine Fisheries Service
Subjects: Ecology
Management
Fisheries
Item ID: 2146
Depositing User: Patti M. Marraro
Date Deposited: 27 May 2009 19:39
Last Modified: 29 Sep 2011 19:33
URI: http://aquaticcommons.org/id/eprint/2146

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