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Life history aspects of greenspotted rockfish (Sebastes chlorostictus) from central California
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2009
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[PDF-291.42 KB]
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Description:"A consolidated life history of greenspotted rockfish, Sebastes chlorostictus, is compiled from past studies and recent data from the Southwest Fisheries Science Center,s Groundfish Ecology Cruise program in central California. Our data indicate similar growth rates for males and females; the von Bertalanffy parameters for both sexes combined are L = 457 mm fork length (FL), k = 0.062 yr-1 and t0 = -1.16 yr. The estimated length-weight relationship is W = 0.00001032L3.108 (weight in grams), and the estimated annual natural mortality rate (M) is roughly between 0.04 and 0.07 yr-1. Length at 50% maturity is 262 mm FL, and fecundity ranges from 14,000 to 414,000 eggs. Linear models provide the best fit of absolute fecundity data with length and weight. In central California, females spawn from March to August, peaking from April to June. Commercial landings of greenspotted rockfish declined from a peak of 430 metric tons (mt) in 1991 to <1 mt in 2003. Reduced landings since the late 1990s are due in part to management restrictions. Mean lengths from California commercial market samples show a declining trend from 1978-2004. The observed life history characteristics of S. chlorostictus (slow growth, sedentary adults, extreme longevity, and late maturity), combined with declines in mean length, may indicate that this species is vulnerable to overexploitation"--Abstract.
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Content Notes:David L. Benet, E.J. Dick, Donald E. Pearson.
"July 2009."
Mode of access: World Wide Web.
System requirements: Internet browser; Adobe Acrobat Reader.
Includes bibliographical references (p. 43-47).
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Rights Information:Public Domain
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