Yellowstone National Park, WY – A 50-square mile drainage in Yellowstone National Park has been closed to fishing because of whirling disease. It's not known when fishing will be allowed to resume in the Pelican Creek drainage. The season was to have opened May 29th. Researchers say the closure was prompted by scientists detecting fewer fish than normal in Pelican creek last August. The goal of the closure is twofold: to prevent the whirling disease parasite from spreading to new areas and to help the stream recover.