Revista de Gestão Costeira Integrada
Volume 11, Número 4, Dezembro 2011, Páginas 389-395

DOI: 10.5894/rgci236
Submissão: 30 Setembro 2010; Avaliação: 7 Novembro 2010; Recepção da versão revista: 25 Julho 2011; Aceitação: 9 Agosto 2011; Disponibilização on-line: 6 Dezembro 2011.

Population Structure and Growth of Young Lemon Shark, Negaprion brevirostris (Poey, 1868), at the Atol das Rocas Biological Reserve, Brazil

Estrutura Populacional e Crescimento de Jovens de Tubarão-limão, Negaprion brevirostris (Poey, 1868), na Reserva Biológica do Atol das Rocas, Brasil

Paulo G. V. Oliveira¹, Diogo Silva de Oliveira^{@, 2},
Patrícia Barros Pinheiro¹, Fábio H. V. Hazin¹, Felipe C. Carvalho^{3, 4}, Dráusio P. Veras¹, Maurizélia B. Silva⁵

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@ - Diogo Oliveira oliveirads@hotmail.com
1 - Laboratório de Oceanografia Pesqueira, Departamento de Pesca e Aqüicultura, Universidade Federal Rural de Pernambuco. Av. Dom Manoel de Medeiros, s/n. Dois Irmãos, 52171-900, Recife– PE. E-mail: oliveirapg@hotmail.com
2 - PPG- Recursos Pesqueiros e Aquicultura- Universidade Federal Rural de Pernambuco.
3 - Department of Fisheries and Aquatic Sciences University of Florida 7922 NW 71st Street Gainesville, Florida 32653.
4 - Florida Program for Shark Research Florida Museum of Natural History, Gainesville, Florida 32611.
5 - Instituto Chico Mendes de Conservação da Biodiversidade - ICMBio.

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ABSTRACT
We conducted expeditions (N=16) to the Rocas Atoll Biological Reserve aiming study the lemon shark (Negaprion brevirostris) population. Young lemon sharks (N=239) were captured, without mortality, using drift gill nets. The frequency of occurrence was higher for males (N=127) than females (N=112) 1.0♂:0.9♀. Upon capture, sharks were sexed, measured (fork length, total length, and interdorsal length), and released alive. A subset of 73 young lemon sharks received an identification tag before being released. Recaptured females and males showed an increase in total length of 12.7 cm/ year and 12.4 cm/ year, respectively.

Keywords: lemon shark, Negaprion brevirostris, juveniles, population structure, growth, Atol das Rocas.

RESUMO
Foram realizadas 16 expedições à Reserva Biológica do Atol das Rocas para o estudo populacional dos tubarões-limão (Negaprion brevirostris) juvenis. Um total de 239 indivíduos foram capturados utilizando-se rede de arrasto. A proporção sexual entre os tubarões capturados foi 1.0♂:0.9♀, com 127 machos e 112 fêmeas. Quando capturados, os tubarões eram sexados, mensurados (comprimentos furcal, total e interdorsal) e libertados com vida. Um subgrupo de 73 espécimes foram marcados e libertados. Machos e fêmeas recapturados demonstraram um aumento no comprimento de 12.7 cm/ano e 12.4 cm/ano, respectivamente.

Palavras-chave: tubarão-limão, Negaprion brevirostris, juvenis, estrutura populacional, crescimento, Atol das Rocas.

 

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