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

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          Abstract

          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.

          Translated abstract

          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.

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          Most cited references46

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          Sperm competition in fishes: the evolution of testis size and ejaculate characteristics.

          Fishes show one of the widest ranges of sperm competition intensity of any animal group. Here we present a comparative study whose aim is to investigate the effect of relative intensity of sperm competition on investment in spermatogenesis and the number and size of sperm produced. We find that both the gonadosomatic index (GSI = [gonad weight/body weight] x 100) and sperm numbers increase with intensity of sperm competition across species but that sperm length decreases. These new findings are consistent with a raffle-based mode of sperm competition in fishes. Most of these results (positive correlation of the GSI and sperm number with sperm competition intensity) concur with the predictions of current sperm competition theory. However, we also find that sperm longevity decreases with sperm length across species. Current models for continuous fertilization suggest that if length increases a sperm's speed but decreases its longevity, sperm length should increase with sperm competition intensity, whereas models for instant fertilization suggest that sperm length should remain constant. The negative relationship found between sperm competition and sperm length therefore does not fit predictions of either model.
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            The Forgotten Requirement for Age Validation in Fisheries Biology

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              Likelihood methods for the von Bertalanffy growth curve

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                Author and article information

                Journal
                bjoce
                Brazilian Journal of Oceanography
                Braz. j. oceanogr.
                Universidade de São Paulo, Instituto Oceanográfico (São Paulo, SP, Brazil )
                1679-8759
                1982-436X
                September 2010
                : 58
                : 3
                : 233-245
                Affiliations
                [01] Faro orgnameUniversity of Algarve orgdiv1Centre of Marine Sciences Portugal
                [03] Olhão orgnameInstituto Nacional de Recursos Biológicos orgdiv1IPIMAR Portugal
                [02] Gainesville FL orgnameUniversity of Florida orgdiv1Dickinson Hall orgdiv2Florida Museum of Natural History US
                Article
                S1679-87592010000300006 S1679-8759(10)05800306
                10.1590/S1679-87592010000300006
                632707c3-8665-4ca9-a1d5-739908b89c29

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 06 May 2010
                : 25 March 2010
                : 13 November 2009
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 38, Pages: 13
                Product

                SciELO Brazil

                Self URI: Full text available only in PDF format (EN)

                Age and growth,NE Atlantic,Idade e crescimento,Fisheries management,Reproduction,Sparidae,Life history,Reprodução,Population dynamics,Dinâmica populacional,Gestão pesqueira,NE Atlântico,Ciclo de vida

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