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Age and growth of the queen triggerfish Balistes vetula (tetraodontiformes, balistidae) of the central coast of Brazil

Abstracts

Dorsal spines (n=649) of the queen triggerfish Balistes vetula were collected between 1997 to 1999 at the central coast of Brazil and used to evaluate fish growth. The marginal increment analysis validated that 1 increment was formed annually (n=476), with minimum values observed at the summer, and coinciding with the maximum proportion of translucent growth bands. Fish's maximum fork length and age were 460 mm and 14 years respectively. The parameters of the von Bertalanffy function were: Fl∞ = 441.3 mm, K = 0.14 and T0= -1.8. Weight gain by year ranged from about 110 g yr-1 for age 5 to about 30 g yr-1 for age 14. Compared to other studies, B. vetula growth in the Central coast of Brazil was slow, which could be related to the influence of the oligotrophic water from Brazil current. Our results indicate that B. vetula's fisheries in the Central coast of Brazil until 1999 have caught mostly adult individuals over the sexual maturation lenght, 60% of them with ages from 6 to 8 yr.

Balistes vetula; Marginal increment; Age determination; Reef fish; Spine Growth marks


Entre 1997 e 1999 foram amostrados 649 espinhos de Balistes vetula na costa central do Brazil e foram utilizados para a avaliação de crescimento. A validação de anéis anuais de crescimento foi realizada através da analise de incrementos marginais, cujos valores mínimos foram observados durante o verão, coincidindo com a maior proporção de anéis translúcidos na borda do espinho. Portanto, forma-se um anel de crescimento a cada ano. A idade e o comprimento padrão máximos observados foram respectivamente 14 anos e 460 mm. Os parâmetros da equação de von-Bertalanffy foram: Fl∞ = 441,3 mm, K = 0,14 e T0= -1,8. O incremento anual em peso variou de 110 g yr-1 para a idade 5 a 30 g yr-1 para a idade 14. Comparados a outros estudos, nossos resultados indicam taxas de crescimento mais baixas, que podem ter sido induzidas pela influência oligotrófica da corrente do Brasil ao longo da costa central do Brasil. Nossos resultados indicam que a pesca do peroá até 1999 estava principalmente voltada a indivíduos adultos, com tamanhos acima do comprimento de primeira maturação sexual e cerca de 60% dos indivíduos capturados apresentando idades entre 6 e 8 anos.

vetula; Incremento marginal; Anéis de crescimento em espinhos; Peixes recifais; Determinação de idades


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Publication Dates

  • Publication in this collection
    17 Oct 2011
  • Date of issue
    Sept 2011

History

  • Accepted
    21 May 2011
  • Reviewed
    10 Mar 2011
  • Received
    26 Sept 2010
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