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Life history of the common pandora, Pagellus erythrinus (Linnaeus, 1758) (Actinopterygii: Sparidae) from southern Portugal

Abstracts

The common pandora, Pagellus erythrinus, is a commercially important seabream for coastal fisheries in the north and central eastern Atlantic. Age, growth and reproductive aspects of the southern Portuguese population were estimated by analysing 386 specimens ranging in total length (TL) from 12.0 to 44.8 cm. Ages were estimated by counting growth bands on otoliths and verified by marginal increment analysis, with specimens ranging in age from 1 to 21 years. The von Bertalanffy growth function was selected as the most adequate model to fit this species' growth, with the estimated parameters being Linf = 47.14 cm TL, k = 0.084 year-1 and t0 = -4.42 year. The gonads were analyzed macroscopically over a one-year period and the reproductive spawning season found to occur from March to July. The length at first maturity for males occurs at 17.58 cm TL and 1.15 years while females mature at slightly smaller sizes (17.29 cm TL) and younger ages (1.04 years). The results presented in this study are important for comparing this population's parameters with those of other populations of the same species occurring in other areas, as well as for future studies, for assessing eventual changes in population parameters over time.

Age and growth; Fisheries management; Life history; NE Atlantic; Population dynamics; Reproduction; Sparidae


A bica, Pagellus erythrinus, é uma espécie comercialmente importante para as pescarias costeiras do norte e centro este Atlântico. A idade, crescimento e aspectos reprodutivos da população que ocorre no sul de Portugal foram estudados através da análise de 386 exemplares com comprimentos totais (TL) entre 12.0 e 44.8 cm. A idade foi estimada pela contagem de bandas de crescimento nos otólitos e verificada pela análise do incremento marginal, tendo-se observado exemplares entre os 1 e 21 anos. A curva de crescimento de von Bertalanffy foi o modelo mais adequado para explicar o crescimento desta espécie, tendo estimado Linf = 47.14 cm TL, k = 0.084 ano-1 e t0 = - 4.42 ano. As gónadas foram analisadas macroscopicamente ao longo do período de um ano e determinou-se que a desova ocorre entre Março e Julho. A primeira maturação dos machos ocorre aos 17.58 cm TL e 1.15 anos enquanto as fêmeas maturam com tamanhos (17.29 cm TL) e idades (1.04 anos) ligeiramente menores. Os resultados apresentados são importantes para a comparação desta população com populações de outras regiões, assim como para a comparação com estudos futuros, para a determinação de eventuais alterações nos parâmetros populacionais ao longo do tempo.

Idade e crescimento; Gestão pesqueira; Ciclo de vida; NE Atlântico; Dinâmica populacional; Reprodução; Sparidae


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Publication Dates

  • Publication in this collection
    03 Nov 2010
  • Date of issue
    Sept 2010

History

  • Received
    13 Nov 2009
  • Accepted
    06 May 2010
  • Reviewed
    25 Mar 2010
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