Pumpkinseed sunfish, I used to catch them as a kid in Eastern Canada.
https://en.wikipedia.org/wiki/Pumpkinseed
Text below is copy/pasted from:
Alien Species in British Columbia: Historical Records
Pumpkinseed (Lepomis gibbosus (L.))
Within the province, Pumpkinseeds are present in Christina Lake, Kootenay Lake, Boldue Lake and Osoyoos Lake on the mainland, and in Beaver, Elk, Prospect, Landford, Blenkinsoop (Swan), Glen, Glintz, Young, and possibly other small lakes on Vancouver Island. They are also found in Colquitz Creek, draining Beaver and Elk Lakes. There appears to be no authoritative record of the introduction of this fish into the Northwest. Lampmam (1949) states that adult largemouth bass and small fry of "various sunfish" were released into the Willamette River in 1893 by the United States Fish Commission, and it is assumed that Pumpkinseeds were included. In any case, they became widespread in Oregon and Washington at a fairly early date, and it is possible that those in the mainland lakes of British Columbia originated from this source by natural spread up the Columbia River and its tributaries.
On the other hand, it has been suggested that Pumpkinseeds were introduced accidentally into the British Columbia lakes along with Black Bass fry. This seems the most likely explanation for their presence on Vancouver Island, where they are found in lakes that also contain Smallmouth Bass.