California salmon deaths traced to thiamine deficiency
The biologists working in a fish hatchery near Shasta Dam grew increasingly concerned last year when newly hatched salmon fry began to act strangely — swimming around and around, in tight, corkscrewing motions, before spiraling to their deaths at the bottom of the tanks. … [S]cientists eventually unlocked part of the mystery: The fish had a deficiency of thiamine, or vitamin B1.