River herring are anadromous fish species belonging to the family Clupeidae. They are found in rivers and streams along the Atlantic coast of North America, from Florida to Newfoundland. The two crossword solutions for the term 'river herring' are SHAD and ALEWIFE. SHAD is a common name for several species of herring found in the Atlantic Ocean, while ALEWIFE is a species of herring found in the Great Lakes and other inland waters.