Salinity on artificial reproduction of silver catfish (Rhamdia quelen)

摘要

Attempting to improve reproduction performance and ichthyo prophylaxis, this study evaluated the effects of maintaining silver catfish (Rhamdia quelen) broodstock in different saline concentrations (0, 2, 4, 6 and 8a€°) on gametes quality and reproductive viability. The results showed that sperm percent motility did not change between 0 and 4a€°, but it was reduced at 6a€°, and sperm became immotile at 8a€° salinity. Sperm motility time was increased (almost five fold) at 6a€°. Salinities up to 4a€° prevented fertilization and hatching, proving their deleterious effects on oocytes and embryos. Therefore, media up to 4a€° salinity may be an alternative for icthyo prophylaxis, although fertilization and incubation must be done in freshwater medium