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Orangespotted Sunfish
Lepomis humilis
Orangespotted Sunfish is a small, hardy lepomid of slow, warm freshwater. It is best known for its orange-and-blue spotting and aggressive feeding on tiny prey, especially in vegetated or muddy waters.
Orangethroat Darter
Etheostoma spectabile
The Orangethroat Darter is a small North American stream fish known for the male’s vivid orange throat and breeding colors. It lives on clean riffles and gravel runs, where it picks tiny aquatic insects and other invertebrates from the bottom.
Oriental Weatherfish
Misgurnus anguillicaudatus
The Oriental Weatherfish is a slender, eel-like loach native to East Asia and widely introduced elsewhere. It thrives in quiet, muddy waters and is famous for tolerating low oxygen by gulping air and even wriggling into moist mud.
Oscar
Astronotus ocellatus
Oscar (Astronotus ocellatus) is a large South American cichlid popular in aquariums and sometimes targeted by anglers in warm freshwater. It is highly territorial, takes a wide range of prey, and often feeds aggressively near cover.
Pearl Cichlid
Geophagus brasiliensis
Pearl Cichlid (Geophagus brasiliensis) is a South American cichlid known for its pearly blue-green spotting and sand-sifting feeding style. It is an adaptable freshwater fish that can become territorial, especially when breeding.
Prussian Carp
Carassius gibelio
Prussian Carp is a hardy cyprinid closely related to goldfish and crucian carp, widely introduced outside its native Eurasian range. It tolerates poor water quality, reproduces successfully without males in many populations, and often becomes abundant in still waters.
Pumpkinseed
Lepomis gibbosus
Pumpkinseed is a small, colorful North American sunfish with a laterally compressed body and a red-edged opercular flap. It lives in warm, calm freshwater and often nests in colonies in shallow water.
Rainbow Darter
Etheostoma caeruleum
Rainbow Darter is a small, colorful North American darter that lives in clear, fast streams with gravel, riffles, and runs. Males show bright blue, orange, and red breeding colors; it is not a typical target species for anglers.
Red Shiner
Cyprinella lutrensis
Red Shiner is a small, colorful minnow native to central and southern North America and widely introduced elsewhere. It thrives in warm, often turbid streams and reservoirs, and males develop a bright red or orange body during spawning.
Red-bellied Pacu
Piaractus brachypomus
Red-bellied Pacu is a South American characin often kept in aquariums and sometimes released into warm waters outside its native range. It is an omnivorous, fruit- and seed-eating fish that can grow large and is occasionally mistaken for piranha despite its blunter teeth.
Redbelly Piranha
Pygocentrus nattereri
Redbelly piranha (Pygocentrus nattereri) is a South American freshwater characiform known for its deep body, red belly, and powerful jaws. It schools in warm rivers, floodplains, and lakes, feeding opportunistically on fish, insects, crustaceans, and carrion.
Redbreast Sunfish
Lepomis auritus
Redbreast Sunfish is a colorful southeastern North American sunfish that favors clear, flowing water. It’s a common panfish and readily takes small natural baits and tiny lures near cover.