DENVER (AP) — Colorado is lifting some fishing restrictions along a 27-mile (43-kilometer) stretch of the Colorado River, thanks to recent rains and lower water temperatures essential to fish. But biologists warn that historically low water flows caused by drought, high water temperatures and wildfire sediment that all starve trout of oxygen could force future bans. Colorado Parks and Wildlife imposed a rare 120-mile (193-kilometer) voluntary fishing ban earlier this month. Tuesday’s move allows anglers — a key driver of Colorado’s summer tourist economy — to fish anytime between midnight and noon, when waters are cooler. Reservoir releases upstream and isolated recent rains contributed to the decision.