Resumo
The monthly analysis of maturity stage frequency suggested that spawning of the grey triggerfish Balistes capriscus (Gmelin, 1788) is annual, total and occurs from November to February in the south of São Paulo State, Brazil. Size at first maturity is 169 mm for females and 200 mm for males. Condition factor estimated considering and disconsidering gonad weight (K and K') showed maximum values related to periods of higher frequency of females at advanced maturity stage. ΔK was higher in December, January and February, and was related to the maximum frequency of mature females. As K estimates the gonad condition it could be used as a maturity and breeding season index for this species. The gonadosomatic relation behaved the same as K values.
Balistes capriscus; grey triggerfish; reproduction; oocyte development; size at first maturity
Balistes capriscus; grey triggerfish; reproduction; oocyte development; size at first maturity
Aspectos da reprodução do peixe-porco, Balistes capriscus (Gmelin) (Actinopterygii, Tetraodontiformes, Balistidae) coletado na costa sul do Estado de São Paulo, Brasil
Reproductive aspects of the grey triggerfish, Balistes capriscus (Gmelin) (Actinopterygii, Tetraodontiformes, Balistidae) from South São Paulo state coast, Brazil
Roberto Ávila Bernardes; June Ferraz Dias
Instituto Oceanográfico, Universidade de São Paulo. Praça do Oceanográfico 191, 05508-900 São Paulo, São Paulo. E-mail: avila@usp.br, junedias@usp.br
ABSTRACT
The monthly analysis of maturity stage frequency suggested that spawning of the grey triggerfish Balistes capriscus (Gmelin, 1788) is annual, total and occurs from November to February in the south of São Paulo State, Brazil. Size at first maturity is 169 mm for females and 200 mm for males. Condition factor estimated considering and disconsidering gonad weight (K and K') showed maximum values related to periods of higher frequency of females at advanced maturity stage. ΔK was higher in December, January and February, and was related to the maximum frequency of mature females. As K estimates the gonad condition it could be used as a maturity and breeding season index for this species. The gonadosomatic relation behaved the same as K values.
Key words:Balistes capriscus, grey triggerfish, reproduction, oocyte development, size at first maturity
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AGRADECIMENTOS. Ao Dr Noriyoshi Yamaguti e à Dra Anna Emília Amato de Moraes Vazzoler
(in memorian),
do Instituto Oceanográfico da Universidade de São Paulo, pelas importantes sugestões durante os estudos sobre esta espécie e à FAPESP pela concessão de bolsa e financiamento (R.A.B.). Agradecemos as valiosas contribuições de dois revisores anônimos.
Recebido em 28.X.1999; aceito em 23.VIII.2000.
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Datas de Publicação
-
Publicação nesta coleção
08 Maio 2009 -
Data do Fascículo
Set 2000
Histórico
-
Aceito
23 Ago 2000 -
Recebido
28 Out 1999
