Kaltura Share to Google Classroom Walhalla State Fish Hatchery raises trout that stock up cold water habitats. This increases the trout population and helps maintain the balance of nature. Grades: 3 4 5 6 7 8 Subjects: ScienceLife ScienceThe Animal KingdomFish Collection: ETV StreamlineSCExplore South CarolinaNational Great Outdoors Month Series: Parks Adventures Minutes