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Age and Growth Estimates for Blacktip, Carcharhinus limbatus, and Spinner, C. brevipinna, Sharks from the Northwestern Gulf of Mexico

Steven Branstetter
Copeia
Vol. 1987, No. 4 (Dec. 9, 1987), pp. 964-974
DOI: 10.2307/1445560
Stable URL: http://www.jstor.org/stable/1445560
Page Count: 11
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Age and Growth Estimates for Blacktip, Carcharhinus limbatus, and Spinner, C. brevipinna, Sharks from the Northwestern Gulf of Mexico
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Abstract

Length at age and growth rates for 54 blacktip, Carcharhinus limbatus, and 15 spinner, C. brevipinna, sharks from the northwestern Gulf of Mexico were estimated from bands formed seasonally in vertebral centra. For C. limbatus, males mature at 130 cm total length (TL) or 4-5 yr, females at 150-155 cm TL or 7-8 yr. With sexes combined, von Bertalanffy curve parameter estimates were: L oo=176 cm TL, K = 0.274, t o=-1.20 yr. The oldest specimen, a 171 cm TL female, was 9.3 yr of age. For C. brevipinna, males mature at 170 cm TL or 6-7 yr of age, females at 180 cm TL or 7-8 yr of age. The oldest specimen, a 208 cm TL female, was 11.3 yr of age. With sexes combined, von Bertalanffy curve parameter estimates were: L oo=214 cm TL, K = 0.212, t o=-1.94 yr. Growth rates for both species are in excess of 20 cm/yr for the first 2 yr, about 10 cm/yr through adolescence, and 5 cm/yr or less for adults.

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