20 research outputs found
Record of morphological deformities in Corydoras aff. longipinnis in two reservoirs under urban influence in Upper Iguaçu and Southern Coastal basins in Paraná State, Brazil
Full text link
Comparison of spermiogenesis in the externally fertilizing Hemigrammus erythrozonus and the inseminating Corynopoma riisei (Teleostei: Characiformes: Characidae)
Full text link
Reproductive dynamics of Lycengraulis grossidens (Clupeiformes: Engraulidae) and Platanichthys platana (Clupeiformes: Clupeidae) in a subtropical coastal lagoon
Full text link
Reconhecimento da localidade de Rödersberg citada por Reinhold F. Hensel em 1867, para o Rio Grande do Sul, Brasil
No full textAlterações histológicas em placas ósseas do peixe cascudo Rineloricaria strigilata (Hensel) (Teleostei, Loricariidae) e sua freqüência no lago Guaíba, Rio Grande do Sul, Brasil
No full textSpatial diet overlap and food resource in two congeneric mullet species revealed by stable isotopes and stomach content analyses
No full textIdade e crescimento de Gymnogeophagus lacustris Reis & Malabarba, um Cichlidae endêmico da bacia hidrográfica do Rio Tramandaí, Rio Grande do Sul, Brasil Age and growth of Gymnogeophagus lacustris Reis & Malabarba, an endemic cichlidae of Tramandaí river basin (Rio Grande do Sul, Brazil)
No full text<abstract language="eng">In the present study it was examined the age and growth of Gymnogeophagus lacustris Reis & Malabarba, 1988 in Caconde lagoon (Tramandaí River Basin). The specimens (1080 males and 267 females) were collected monthly, between July 1992 and June 1993. The growth curve in total length was obtained by von Bettalanffy expression and the weight curve through the dedutive method supported by the mathematical expressions of the length growth curve and the length/weight relationship. Formation of the annulli in scales ocurred between winter and spring, and the first anual ring appears when the animals are aproximately 1.5 years old. L∞ and W∞ obtained for males and females, were 206.6mm and 157.3g and 120.2mm and 30.2g, respectively, demonstrating a characteristic sexual dimorfism for the species
