Ty Walker squats on the grassy banks of a 150-foot-long, 10-foot-wide earthen pond lifting a net filled with thrashing young rainbow trout from the churning spring water. He nudges a pair of curious Great Pyrenees away, then carefully drops a dozen fish into a large bucket of water and hoists it onto a scale for his wife, Shannon, to log the results in a notebook. “We’re calculating average weights to get a bead on how fast the fish are growing and when they should be ready to harvest,” says Ty….
