Both native and non-native fish inhabit many lakes and ponds across Jasper National Park. Prior to stocking practices in the past, many lakes in Jasper National Park did not have fish or had a low diversity fish assemblage. These past stocking practices have altered fish communities today. Introduced non-native fish may outcompete some native fish populations and the stocking of historical natural fishless lakes may affect their food webs. Data collected during fish surveys show existing native and non-native fish species in lakes of Jasper National Park.