Age, growth, mortality, and radiometric age validation of gray snapper (Lutjanus griseus) from Louisiana

Fischer, Andrew J. and Baker Jr., M. Scott and Wilson, Charles A. and Nieland, David L. (2005) Age, growth, mortality, and radiometric age validation of gray snapper (Lutjanus griseus) from Louisiana. Fishery Bulletin, 103(2), pp. 307-319.

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Abstract

The gray snapper (Lutjanus griseus) is a temperate and tropical reef fish that is found along the Gulf of Mexico and Atlantic coasts of the southeastern United States. The recreational fishery for gray snapper has developed rapidly in south Louisiana with the advent of harvest and seasonal restrictions on the established red snapper (L. campechanus) fishery. We examined the age and growth of gray snapper in Louisiana with the use of cross-sectioned sagittae. A total of 833 specimens, (441 males, 387 females, and 5 of unknown sex) were opportunistically sampled from the recreational fishery from August 1998 to August 2002. Males ranged in size from 222 to 732 mm total length (TL) and from 280 g to 5700 g total weight (TW) and females ranged from 254 to 756 mm TL and from 340 g to 5800 g TW. Both edge analysis and bomb radiocarbon analyses were used to validate otolith-based age estimates. Ages were estimated for 718 individuals; both males and females ranged from 1 to 28 years. The von Bertalanffy growth models derived from TL at age were Lt = 655.4{1–e[–0.23(t)]} for males, Lt = 657.3{1–e[– 0.21(t)]} for females, and L t = 656.4{1–e[– 0.22 (t)]} for all specimens of known sex. Catch curves were used to produce a total mortality (Z) estimate of 0.17. Estimates of M calculated with various methods ranged from 0.15 to 0.50; however we felt that M= 0.15 was the most appropriate estimate based on our estimate of Z. Full recruitment to the gray snapper recreational fishery began at age 4, was completed by age 8, and there was no discernible peak in the catch curve dome.

Item Type: Article
Title: Age, growth, mortality, and radiometric age validation of gray snapper (Lutjanus griseus) from Louisiana
Personal Creator/Author:
CreatorsEmail
Fischer, Andrew J.
Baker Jr., M. Scott
Wilson, Charles A.
Nieland, David L.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 103
Number: 2
Page Range: pp. 307-319
Date: 2005
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 9616
Depositing User: Patti M. Marraro
Date Deposited: 03 Aug 2012 14:31
Last Modified: 04 Aug 2012 18:21
URI: http://aquaticcommons.org/id/eprint/9616

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