Age and growth parameters of cachara Pseudoplastystoma reticulatum (Siluriformes, Pimelodidae) from the Cuiabá River, Brazil

Iheringia. Série Zoologia

Talitha M. Francisco²  Angela Maria Ambrósio¹  Thiago José Balbi¹  Marina S. Zuliani¹  Edson K. Okada²  Luiz C. Gomes² 

[1] ,Universidade Estadual de Maringá Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura Maringá Paraná ,Brazil

关键词: Growth rings;    pectoral fins;    von Bertalanffy model;    Ford-Walford;    Marcas de aposição;    nadadeira peitoral;    modelo de von Bertalanffy;    Ford-Walford;   

DOI  :  10.1590/S0073-47212011000300004

来源: SciELO

【 摘 要 】

Age and growth parameters of cachara Pseudoplatystoma reticulatum (Eigenmann & Eigenmann, 1889) (Siluriformes, Pimelodidae) (males and females) were estimated through the analysis of growth rings in spines of pectoral fins. Fish were collected from January to December 2007, in the area directly influenced by the Aproveitamento Múltiplo de Manso (APM Manso) and in the Cuiabá River (upper parts of the Pantanal). The maximum number of growth rings was seven for males, and eight, for females. The analysis of temporal variations in mean marginal increment showed that rings found in the spines were formed annually, in December. Growth rings were associated to spawning (in the study region from November to March) of the species. The growth curve in length was obtained by the von Bertalanffy model adjusted by the Ford-Walford transformation. The equations are: Ls = 72.7*[1-e-0.44(t+1.5974)] for males, and Ls = 84.5*[1-e-0.33(t+2.0943)] for females. The equations that describe the growth curve in weight are: Wt = 4991.61*[1-e-0.44 (t+1.5974] 2.70 for males and Wt = 7503.17*[1-e-0.33 (t+2.0943] 2.99 for females.

【 授权许可】

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