Capt. Art Gaeten holds a blue shark that was caught during a research trip in Nova Scotia. Scientists are studying the impact of swordfish fishing methods on the shark population. (NPR photo/Dean Casavechia)

NPR investigative reporter Daniel Zwerdling’s three-part series on sustainable seafood began airing during All Things Considered on Monday evening, February 12, 2013. Because of this story’s unusual length (22 minutes), KCAW’s automation system interrupted the broadcast with routine programming announcements. Please accept our apologies for this glitch. Listen to all three stories in the series, uninterrupted, here.