COLUMBIA FALLS — Under April’s “Pink Moon,” Sewell Look and Lewis Emerson and others spent last Thursday night tramping around with flashlights in the puckerbush and local brooks and streams. Their nocturnal foray was part of an annual marathon to catch enough smelts to feed more than 400 people who turned out for the Downeast Salmon Federation’s 2009 Smelt Fry and Potluck Supper.