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POPULATION DYNAMICS OF THE RED SWAMP CRAYFISH, PROCAMBARUS CLARKII (GIRARD, 1852) FROM THE AVEIRO REGION, PORTUGAL (DECAPODA, CAMBARIDAE)

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The life cycle of the red swamp crayfish, Procambarus clarkii from a shallow lagoon in the Aveiro region was studied for 14 months. Analysis of the size frequency distribution and growth provided evidence for an extended recruitment period with a peak in autumn (October/November). Females clearly outnumbered males and the average sex-ratio (males/females) was 0.36. The values for the Von Bertalanffy growth parameters were L 62.01 mm, K = 0.23, and t0 = 0.11 month. = The high abundance of this species and the extended recruitment period, support the need for a proper management and exploitation of this biological resource.

O ciclo de vida do lagostim-vermelho-da-Louisiana Procambarus clarkii da ria de Aveiro foi estudado ao longo de 14 meses. A análise da distribuição das frequências de tamanho e de crescimento mostrou um período de recrutamento extenso com um máximo no Outono (Outubro/Novembro). As fêmeas ocorreram com maior abundância que os machos, o que se traduziu numa proporção de sexos (machos/fêmeas) de 0,36. Os valores calculados para os parâmetros de crescimento de Von Bertalanffy foram L∞ = 62,01 mm, K = 0,23 e t0 = 0,11 mês. A elevada abundância desta espécie e o largo período de recrutamento apontam para a necessidade de uma adequada gestão e exploração deste recurso biológico.

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/content/journals/10.1163/156854001300104453
2001-04-01
2015-09-02

Affiliations: 1: Department of Zoology and Anthropology, Faculty of Sciences, University of Porto, Praça Gomes Teixeira, P-4099-002 Porto, Portugal

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