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Topmouth Gudgeon
Pseudorasbora parva
Topmouth Gudgeon is a small invasive cyprinid native to East Asia and now established across much of Europe and parts of Asia. It thrives in warm, still waters and is known for rapid spread and competition with native fishes.
Walking Catfish
Clarias batrachus
Walking catfish (Clarias batrachus) is a hardy air-breathing catfish that can wriggle over damp land between waters. It is an invasive, opportunistic feeder in many places and is often caught as a nuisance or bycatch rather than a targeted game fish.
Walleye
Sander vitreus
Walleye (Sander vitreus) is a freshwater percid prized by anglers for its excellent table quality and low-light feeding habits. It inhabits cool to moderately warm lakes and large rivers across much of northern North America, with populations also widely stocked beyond the native range.
Warmouth
Lepomis gulosus
Warmouth (Lepomis gulosus) is a hardy sunfish of warm, weedy freshwater ponds, sloughs, swamps, and slow backwaters. It often hides around cover and ambushes small prey, making it a common but under-targeted panfish.
Wels Catfish
Silurus glanis
The Wels Catfish is one of Europe’s largest freshwater predators, with a long, scaleless body and broad flattened head. Native to large rivers, lakes, and reservoirs, it is now widely introduced beyond its original range.
Western Blacknose Dace
Rhinichthys obtusus
Western Blacknose Dace (Rhinichthys obtusus) is a small North American cyprinid found in clear, cool streams. It lives near the bottom in riffles and runs, where it feeds on tiny aquatic and terrestrial invertebrates.
Western Blacktail Shiner
Cyprinella venusta
The Western Blacktail Shiner is a small North American minnow found mainly in streams and rivers of the south-central United States. It’s known for a dark tail spot and reflective body, and it often schools in moderate current over sand, gravel, or riffles.
Western Mosquitofish
Gambusia affinis
Western Mosquitofish is a small livebearing freshwater minnow widely introduced around the world for mosquito control. It is hardy, aggressive, and often abundant in warm shallow waters where it can outcompete native fishes.
White Bass
Morone chrysops
White bass (Morone chrysops) is a schooling temperate bass native to central North America, often moving in open water to feed on small baitfish. It is a popular panfish-sized game fish that commonly runs rivers, reservoirs, and lakes during spawning and feeding migrations.
White Catfish
Ameiurus catus
White Catfish (Ameiurus catus) is a hardheaded channel catfish relative native to Atlantic-slope drainages of the eastern United States and widely introduced elsewhere. It favors slow, muddy fresh water and feeds mostly at night on benthic invertebrates, small fish, and carrion.
White Crappie
Pomoxis annularis
White crappie (Pomoxis annularis) is a schooling freshwater sunfish prized by anglers for its size and table quality. It prefers stained water and often spawns and feeds around cover in lakes, reservoirs, and slow rivers.
White Sucker
Catostomus commersonii
White Sucker (Catostomus commersonii) is a widespread North American sucker found in cool to warm freshwater streams, rivers, and lakes. It feeds by sucking up bottom invertebrates and detritus, and is often overlooked by anglers but can be caught readily on natural baits.