Mysterious infection is killing B.C. salmon - The Globe and Mail

Mysterious infection is killing B.C. salmon - The Globe and Mail: "Large numbers of sockeye salmon are dying in the Fraser River, before spawning, because of a mysterious virus, new research suggests.

Historical records show that some fish always die en route to their spawning beds, but since the early 1990s the problem has become increasingly acute – with more than two million fish dying in some years. Researchers have long puzzled over what was causing the seemingly healthy fish to suddenly stop swimming and turn belly up."