sentences:  Trout fishing is allowed off season year around on a catch and release basis.River otters can be seen in the river, where the Cantara Loop trail derailment and chemical spill once sterilized this section of the river—the area upstream from the spill gradually restored much of the river's biosphere, and the fishery is healthy, though crayfish and frogs have yet to reappear.Mink, cougar, bear, fisher and martin are sometimes in the immediate area.