Salmon Sperm Activated in Ovarian Fluid (video) University of East Anglia Loading video... Caption University of East Anglia scientists have revealed how females select the 'right' sperm to fertilize their eggs when faced with the risk of being fertilized by wrong sperm from a different species. Researchers investigated salmon and trout. They found that when eggs from each species are presented with either salmon or trout, they allow fertilization by either species' sperm. But if eggs are given a choice of both species' sperm, they favour their own species'. Credit University of East Anglia Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.