Año 1986, Número 6- 57-75

Año 1986, Número 6- 57-75

Sverlij, S.B.; Espinach Ros, A. 1986.  El dorado, Salminus maxillosus (Pisces, Characiformes) en el Río de la Plata y Río Uruguay inferior.
Rev. Invest. Desarr. Pesq.  6: 57-75.
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Catch per unit effort (CPUE), length distribution, age, growth, reproduction, migrations and feeding were studied through samples collected with longlines and a gang of gill-nets of several mesh size. CPUE data showed a progressive decrease of the relative abundance in the Río de la Plata, during the study period. Age was studied from scales. Back-calculations of growth revealed the presence of Lee’s phenomenon. Means lengths at age were greater in females. No significant difference was found in length-weight regressions from both sexes and sampling areas. Only young individuals from 1 to 6 years were caught. None of the fish studied had ripening gonads. Extensive migrations were recorded both in the Paraná and Uruguay rivers. Stomach contents analysis confirmed the ichthyophagous habits of the species.