Several sperm parameters have been employed as useful tools to evaluate fish fertility. Within teleosts, approximately 3% of fish species are known to be viviparous. The Order Cyprinodontiformes includes several species ...

Cytochrome P450 aromatase is the steroidogenic enzyme that catalyzes the conversion of androgens to estrogens. Teleosts express two structurally and functionally different P450 aromatase isoforms, termed Cytochrome 19a1a ...

The first report of the genus Jenynsia occurring in marine waters is presented here. The evolution of high salinity tolerance within Anablepidae is discussed and a hypothesis is proposed that this characteristic is a ...

Carbamazepine (CBZ) is an anticonvulsant drug, prescribed worldwide for the treatment of epilepsy, bipolardisorder and trigeminal neuralgia, which has been frequently detected in aquatic environments. The objectiveof this ...

The Atlantic drainage basins are located in the southern Pampean area, in the southernmost part of the Brazilian subregion. Tectonic and paleoclimatic phenomena, occurring during the Quaternary, have currently isolated ...