The latest U.S. Geological Survey found that 85 percent of male smallmouth bass in and near wildlife refuges in the Northeast show compromised fertility: They have eggs where their testes should be, according to the Washington Post. Earlier, surveys had found as much as 100 percent of fish in the southern Potomac River were affected, and 90 percent in West Virginia. A reported 37 species of fish have been identified as exhibiting “intersex changes” that affect fertility, and although scientists have not yet identified the culprit, many believe endocrine disrupting chemicals are to blame.