The bright little sunfish in the weeds at the edge of a warm Kootenay lake is an invader the province would rather you never moved.
The pumpkinseed is a sunfish, a small, round, gaudy fish from eastern North America. The province’s invasive species alert describes it as deep-bodied, thin and nearly disc-shaped, brown to olive overall, with an orange to red-orange breast and belly and a scatter of orange, yellow, blue and emerald spots over the back and sides. Breeding males are the brightest of all. It grows to about 20 centimetres in British Columbia, so it is a panfish, not a sport fish anyone travels for.
It is here because people put it here. The alert says pumpkinseed were stocked in British Columbia for sport fishing, released by aquarium owners who could no longer keep them, and have spread up the Columbia River system from introduced populations in Washington and Idaho. Fisheries and Oceans Canada dates the expansion into the province to the early 1900s, through the Columbia, and says they have since entered the Kootenay River system. Some were introduced as forage for predators such as
largemouth bass.
For a fly angler in the Kootenays, the pumpkinseed is the fish that grabs a small fly in the warm shallows while you are looking for
bass or trout. It is worth knowing on sight, and worth never carrying anywhere.