Bluegill in the context of "Black bass"

Centrarchidae, better known as sunfishes or centrarchids, is a family of freshwater ray-finned fish belonging to the order Centrarchiformes, native only to North America. There are eight universally included genera within the centrarchid family: Lepomis (true sunfishes), Micropterus (black basses), Pomoxis (crappies), Enneacanthus (banded sunfishes), Centrarchus (type genus, consisting solely of the flier C. macropterus), Archoplites (Sacramento perch), Ambloplites (rock basses), and Acantharchus (mud sunfish). Their closest relatives are the pygmy sunfishes of the family Elassomatidae, which are sometimes placed in the same family, although presently treated as distinct.

The centrarchid family comprises 38 identified species, 34 of which are extant. It includes many popular game fishes familiar to North American anglers, such as the rock bass, largemouth bass, bluegill, pumpkinseed, green sunfish and crappies. Most sunfish are highly valued panfish for sport fishing, and have been introduced in many areas outside their native ranges, sometimes becoming invasive species. While edible, they are not commercially marketed as food fish.

Lepomis or true sunfish is a genus of North American freshwater fish from the family Centrarchidae in the order Centrarchiformes. The generic name Lepomis derives from the Greek λεπίς ("scale") and πῶμα ("cover", "plug", "operculum"). The genus' most recognizable species is perhaps the bluegill.

Some Lepomis species can grow to a maximum overall length of 41 cm (16 in), though most average around 10–20 cm (3.9–7.9 in). Many species are sought by anglers as popular panfishes, and large numbers are bred and stocked in lakes, rivers, ponds and wetlands. They are widely distributed throughout the freshwater lakes and river tributaries of the United States and Canada, and several species have been translocated and flourished around the world, even becoming pests. Aquarium trade in some Lepomis species is prohibited in Germany for this reason.

The Trent River is a river in Southeastern Ontario that flows from Rice Lake to empty into the Bay of Quinte on Lake Ontario. The river is part of the Trent-Severn Waterway, which leads to Georgian Bay, and is 90 kilometres (56 mi) long. The Trent drains a large portion of South-Central Ontario including most of the Kawartha Lakes and their supplying watersheds.

The river is host to numerous species of birds, amphibians and fish. Some species of fish in the river include Smallmouth bass, Largemouth bass, Pike, Walleye, Freshwater drums, Crappie, as well as other smaller fish such as Sunfish, Rock Bass and Bluegill.