The reproductive biology of Diplodus argenteus (Sparidae) in the coastal upwelling system of Cabo Frio, Rio de Janeiro, Brazil

  • GS David Universidade Federal de São Carlos,Via Washington Luiz, Km 235, S.Carlos-SP, Brazil; current address: Apta Regional Centro Oeste –Unidade de Pesquisa e Desenvolvimento de Barra Bonita, Avenue Pedro Ometto, 874, Barra Bonita-SP, Brazil CEP 17.340-000
  • R Coutinho Instituto de Estudos do Mar Almirante Paulo Moreira, Rua Kioto, 253, Arraial do Cabo-RJ, Brazil
  • I Quagio-Grassiotto Instituto de Biociências, Universidade Estadual Paulista, Botucatu-SP, Brazil CP 510 – 18.618-000
  • JR Verani Universidade Federal de São Carlos,Via Washington Luiz, Km 235, S.Carlos-SP, Brazil
Keywords: <i>Diplodus</i>, reproduction, seabream, Sparidae, upwelling

Abstract

The reproductive biology of the seabream Diplodus argenteus, a dominant coastal fishery species, was investigated over two consecutive seasons (2001–2002) at Cabo Frio, Brazil, a low-latitude upwelling system. The sex ratio was dominated by females (1.4:1.0) and the length-at-50% sexual maturity (females) was 203mm total length. Females were multiple spawners and the reproductive pattern appeared to be digynous protandrous hermaphroditism. Monthly variations in gonadosomatic index and proportion of ripe females indicated that reproductive activity occurred from late winter to summer (August–February), following coastal upwelling.

Keywords: Diplodus, reproduction, seabream, Sparidae, upwelling

African Journal of Marine Science 2005, 27(2): 439–447
Published
2005-11-04
Section
Articles

Journal Identifiers


eISSN: 1814-2338
print ISSN: 1814-232X