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Título:
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Age, growth rate and longevity of Carcharhinus leucas estimated from tagging and vertebral rings (1982)
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Autores:
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Thorson, Thomas B., Autor ;
Lacy Jr., Edward J., Autor
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Tipo de documento:
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Article : texto impreso
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En :
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Copeia (1982 n° 1, Variada)
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Artículo en la página:
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pp. 110-116
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Idiomas:
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Inglés
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Resumen:
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Data from eight long-term tagging-recapture records and counts of vertebral calcification rings of 15 individuals were combined to develop a model for age determination, growth rate and longevity for the population of Carcharinus leucas that occurs in the Lake Nicaragua-Río San Juan System of Nicaragua and Costa Rica. The growth rate is relatively rapid in the first two years (18 and 16 cm per year), slows gradually to 12 and 11 cm per year and appears to remain at 9 or 10 cm per year for the later years of life. Females have been taken as much as 251 cm long, while males have reached only 214 cm. The proposed growth curve is based on males, except for some of the smallest individuals, so growth rate can only be surmised for large females, by extrapolation. The available evidence suggests that they reach their larger size mainly through longer life-approximately 16 years for females of about 2.5 meters to about 12 years for males of maximum size.
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