Lamprey populations across the Pacific Northwest have fallen in the past half century. An Oregon State University estimate says they are at 5 to 10 percent of their numbers half a century ago. Conservation officials and Native American tribes say this is troubling because of lampreys’ importance to the ecosystem. Now an effort is underway to monitor the numbers of these eel-like fish in southern coastal Oregon, to help researchers learn about their migration patterns and challenges. KLCC’s Brian Bull reports.