Pumpkinseed
Species · Lepomis gibbosus

Pumpkinseed

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.

The quick read

A small, disc-shaped sunfish with an orange belly and a black gill flap tipped with a red half-moon. It lives in warm, clear, weedy shallows of small lakes, ponds and quiet streams. It is an introduced species that the province lists as invasive: do not move one alive, and do not use one as bait.

Range in British Columbia

The provincial alert records numerous occurrences in the Kootenay-Boundary, Thompson-Okanagan, South Coast and West Coast regions, and expects warm-water preference to limit its spread into central and northern British Columbia. Fisheries and Oceans Canada adds the lakes of the Columbia, Thompson and Fraser watersheds, southern Vancouver Island and the lower Fraser Valley.

In the Kootenays

The records here are lake-edge records. Local beat records on Holland Creek, a short tributary of Windermere Lake in the Columbia Valley, include pumpkinseed among a warmwater mix of largemouth bass, northern pikeminnow, sculpin, peamouth chub, suckers and redside shiner. The wider Windermere fish assemblage in the guide’s records also includes pumpkinseed. On Kootenay Lake, the provincial dataset of historical fish records, which runs from 1901 to 2022, includes pumpkinseed among its reported taxa. Those are records of a fish having been found, not evidence that you will find one today.

Habitat and behaviour

Fisheries and Oceans Canada describes pumpkinseed living in quiet, slow streams, small lakes and ponds, and the shallow, weedy bays of larger lakes, preferring clear water with submerged vegetation or brush. They gather in large numbers and often make up most of the fish in a small, warm water. The provincial alert says the adults eat a wide range of prey, which lets them live in many kinds of habitat; Fisheries and Oceans Canada notes they eat amphibians and small fish, and that they contributed to the loss of unique stickleback species on Vancouver Island.

Confusing species

The provincial alert names three look-alikes. A bluegill, also introduced in British Columbia, lacks the red half-moon at the rear edge of the black gill flap, and its seven or eight dark vertical bars are bolder and more regular than a pumpkinseed’s fainter, irregular ones; a pumpkinseed also has narrow, wavy orange-brown or light-blue stripes. The two species hybridize. A black crappie has anal and dorsal fin bases of equal length, while a pumpkinseed’s anal fin base is half the length of its dorsal. The warmouth looks similar but has no confirmed introduction in British Columbia.
The other small introduced fish of the same warm water is the yellow perch, which the Freshwater Fisheries Society of BC pairs with pumpkinseed in its guide to invasive freshwater fish. Its own page covers how to tell it apart.

Fishing for them

No agency source gives fly advice for pumpkinseed, so take this as general practice. Fish where the agencies say they live: the shallow, weedy edges of warm water in summer. A small nymph, a size 12 or 14 Woolly Bugger or a small damsel pattern fished slowly by the weed will be found. They are most often a by-catch while fishing damselflies or leeches for trout, or casting to bass.

Spawning season

Pumpkinseed nest. FishBase describes males building nests in very shallow water near shore, guarding the eggs for about a week and the young for about eleven days, then preparing the nest again for another spawning. The provincial alert says females lay 600 to 14,000 eggs at a time and that the fry can grow quickly, which is why a population can grow fast. No British Columbia source gives the spawning months.

Rules that apply

The 2025–2027 Region 4 Kootenay regulations do not name a daily quota for pumpkinseed, and the regional closure on fishing for bass, perch, pike and walleye does not list it. It is not on the synopsis’s list of freshwater game fish, and neither the synopsis nor the federal BC Sport Fishing Regulations set a quota for it. Check the current synopsis for how it is treated on the water you are fishing.
The rules that matter most are general. Under the provincial regulations you may not keep live fish in your possession in the wild, move live fish, or transplant them into any water; you may not keep angled fish alive in a livewell or on a stringer; and you may never use live fish as bait. The provincial alert asks anglers not to transfer or release live pumpkinseed, and to report new sightings through the Report Invasives app or the province’s online form. Check the current regulations before you fish.

Frequently asked questions

Is this a pumpkinseed or a bluegill?

Look at the back edge of the black gill flap. A pumpkinseed has a red half-moon spot there. A bluegill does not.

Is it a problem if I catch one?

No. Catching one is fine. Moving one alive, or using one as bait, is not, and it is how they reach new water.

Why do they matter in a trout country?

Because they eat and compete with native fish. Fisheries and Oceans Canada describes them reaching high densities, competing with native fish and harming native communities, and the province lists them as invasive.