Changes in the life history of red porgy, Pagrus pagrus, from the southeastern United States, 1972-1994

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Author

Harris, Patrick J.

McGovern, John C.

Subject

Red porgy

Description

Aspects of the life history of red porgy from the South Atlantic Bight (SAB) were examined for four periods (1972-74, 1979-81, 1988-90, and 1991-94), and annual changes in the age and growth of red porgy were described for data collected during 1988-94. The life history of red porgy during 1972-74 was assumed to represent that of an unfished population. although this population had been subject to light fishing pressure. From 1972-74 to 1979-81, the back-calculated size-at-age increased slightly for ages 2-8. By 1988-90 and 1991-94. however, the back-calculated size-at-age for the same age classes was significantly smaller than that in 1979-81. In addition, size-at-maturity and size-at-sexual-transition occurred at progressively smaller sizes for 1988-90 and 1991-94. The mean size-at-age (observed and back-calculated) declined for most ages between 1988 and 1994. Von Bertalanffy growth curves fitted to the mean back-calculated size-at-age for each year showed similar decreasing trends. Changes in life history may be a response to sustained 20-year overexploitation that has selectively removed individuals predisposed towards rapid growth and larger size.

URI

http://hdl.handle.net/10827/10547

Collections

• Fishery Bulletin

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Date

1997

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Date Accessioned	2013-08-22T14:12:51Z
Date Available	2013-08-22T14:12:51Z
dc.description	Aspects of the life history of red porgy from the South Atlantic Bight (SAB) were examined for four periods (1972-74, 1979-81, 1988-90, and 1991-94), and annual changes in the age and growth of red porgy were described for data collected during 1988-94. The life history of red porgy during 1972-74 was assumed to represent that of an unfished population. although this population had been subject to light fishing pressure. From 1972-74 to 1979-81, the back-calculated size-at-age increased slightly for ages 2-8. By 1988-90 and 1991-94. however, the back-calculated size-at-age for the same age classes was significantly smaller than that in 1979-81. In addition, size-at-maturity and size-at-sexual-transition occurred at progressively smaller sizes for 1988-90 and 1991-94. The mean size-at-age (observed and back-calculated) declined for most ages between 1988 and 1994. Von Bertalanffy growth curves fitted to the mean back-calculated size-at-age for each year showed similar decreasing trends. Changes in life history may be a response to sustained 20-year overexploitation that has selectively removed individuals predisposed towards rapid growth and larger size.
Media Type	Document
Item Language	English
Publisher	South Carolina State Library
Digital Collection	South Carolina State Documents Depository
Rights	Copyright status undetermined. For more information contact, South Carolina State Library, 1500 Senate Street, Columbia, South Carolina 29201.
Type	Text
Digitization Specifications	This South Carolina State Document was either saved from a document available publicly online in PDF format or converted to PDF using Adobe Acrobat X Professional.