Brook Trout (IMAGE) Penn State Caption A genetic analysis of wild brook trout in streams across Loyalsock Creek drainage has shown that the fish are very similar genetically, suggesting close relatedness among populations. The only way that could have happened, according to researchers, is fish moving between tributaries in Loyalsock Creek. Credit Shannon White, Penn State Usage Restrictions non commercial use only License Licensed content 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.