Age and growth of Pseudoplatystoma corruscans (Siluriformes: Pimelodidae) at the confluence of the Paraná and Paraguay rivers

Abstract The age and growth of Pseudoplatystoma corruscans, is analyzed on specimens landed in Puerto Antequera, Province Chaco, Argentina. study based length frequency distribution 1192 individuals marks 293 pectoral spines. Previously to assignation spines readings, we performed analyses that ruled out age-associated resorption rings corroborated the annual periodicity mark formation. average sizes radius each ring were obtained, total fish back-calculated time formation, by regression model fitted between respective fish. Such data showed a good fitting models von Bertalanffy, Gompertz logistic for both sexes separately. Results indicate species must be carried sex separately fishing regulations consider this characteristic since current management guidelines could promoting differential capture sexes.