SHEPHERDSTOWN, W.Va. - Scientists studying intersex fish in the Potomac River basin have found the abnormality for the first time in redbreast sunfish, the third species affected by the mysterious phenomenon, a federal fish pathologist said Tuesday. Intersex fish possess both male and female characteristics. For example, some male fish have been found with immature eggs in their testes. The phenomenon was previously documented in smallmouth and largemouth bass in the Potomac River and some of its tributaries in Maryland, Pennsylvania, Virginia and West Virginia. Vicki Blazer of the U.S. Geological Survey said she verified the abnormality in sunfish last...