Among the specimens of the Cichlidae family collected in the central region of the State of Rio Grande do Sul (Brazil), the initial studies were done in genera represented by orbicular forms, which comprise: Aequidens, Cichlaurus and Geophagus. Of these genera, four species were found in different proportions: Aequidens portalegrensis, Cichlaurus facetus, Geophagus brasiliensis and Geophagus gymnogenys.
The ictiologic survery of the fauna of the Jacuí and Jacuizinho rivers, (RS – Brazil) lead to the identification of twenty species, Astyanax bimaculatus and Astyanax fasciatus and as well as Hemiancistrus sp being more abundant and uniformly distributed during the months of collet while Symbranchus marmoratus and Oligosarchus hepsetus were the more seldom found fishes.
This paper deals with the finding of Leporinus lacustres Campos, 1945 in the state of Rio Grande do Sul. The samples studied were collected in the Ibicui – Mirim (1982-1983) and Santa Maria (1984-1985) rivers and presented some morphometric and meristic differences when compared to descriptions made by other authors.
Eleven specimens of fish of the Crenicichla gender from the Ibicuí-Mirim and Santa Maria rivers were studied and identified as C. vittata Heckel, 1840. The data obtained (morphometric, merystic and coloring) were compared with those available in the literature.
Eighty three specimens of fish known as "joanas", belonging to the Zoological Collection of the Biology Department, University of Santa Maria, originating from the Ibicui River and the Dam of the Pisciculture Sector of the same Institution were studied and identified as Crenicichla lepidota Heckel, 1840 and theyr meristic and morphometric data compared with the data available in the literature.
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