Exercise is something we often talk about in January, usually in the context of getting healthier.
But here in Idaho, biologists and engineers are looking for ways to get fish more exercise. Specifically - trout, salmon, and steelhead raised in hatcheries. The idea is to force fish to work out so they're in better shape - and more likely to live - once they're released.
Right now, hatchery fish are raised in long, rectangular tanks called raceways. The tanks are hard to clean and sweeping out fish waste is expensive.