Fish - Catoctin Mountain Park (U.S. National Park Service)

Catoctin Mountain Park, Maryland

Nature - Catoctin Mountain Park (U.S. National Park Service)

Natural Resource Monitoring at Catoctin Mountain Park (U.S. National Park Service)

Fish - Catoctin Mountain Park (U.S. National Park Service)

Catoctin Mountain Park (U.S. National Park Service)

The National Parks of the United States by State - Travel Past 50

Learn About the Park - Catoctin Mountain Park (U.S. National Park Service)

History of the National Park Service - Wikipedia

Catoctin Mountain Park (U.S. National Park Service)

Catoctin Mountain Park (U.S. National Park Service)

Lian Kwong on X: If you ever wondered what dead steelhead eggs look like… this is it…🍳 #steelhead #salmon / X

Egg Fly - Trout

Soft Green Egg Pack for Rainbow Trout, Brown Trout, Steelhead and Salmon – Dead Eggs Ltd

Freshwater Rivers Eggs of Atlantic Salmon Salmo salar Tea river, Galicia, Spain Stock Photo - Alamy

Hidden phosphate reservoirs discovered in microorganisms - GEOMAR