Fish Identification Guide
Bluegill: Characterized by 5 to 9 vertical bars on the sides and a distinctive black opercular flap with no margin. Notable for a dark spot at the rear of the dorsal fin.
Redear Sunfish: Recognizable by the opercular flap edged with red or orange.
Black Crappie: Identified by 7 to 8 dorsal spines and random blotchy patterns along the sides.
White Crappie: Known for its 6 dorsal spines, with black side markings forming vertical bars rather than random spots.
Black Bass Types
Largemouth Bass: Distinguished by an upper jaw that extends beyond the back of the eye.
Smallmouth Bass: Notable for an upper jaw that does not extend beyond the back of the eye.
Spotted Bass: Identified by a red eye and horizontal dark spotted lines on the lower sides. The upper jaw does not extend beyond the back of the eye.
True Bass Varieties
Hybrid Striped Bass: Features two tooth patches on the back of the tongue that are joined, and distinct stripes, with the first stripe below the lateral line running complete to the tail.
White Bass: Characterized by a single tooth patch on the back of the tongue and incomplete stripes below the lateral line.
Striped Bass: Identified by two parallel tooth patches on the back of the tongue and unbroken stripes above the lateral line.
Blue Catfish: Notable for 30 to 35 anal fin rays and a straight margin on the anal fin. The caudal fin is deeply forked.
Channel Catfish: Features 24 to 29 rays in a rounded anal fin and dark spots on sides when young.
Flathead Catfish: Distinguished by 14 to 17 anal fin rays and a slightly rounded or notched caudal fin.
Yellow Perch: Recognizable by its green back and 6 to 8 darker vertical bars along yellow-green sides.
Sauger: Identified by 3 or 4 saddle-shaped blotches on the back and sides, with a spotted dorsal fin.
Walleye: Distinguished by the absence of spots on the dorsal fin and a dusky spot at the rear of the spiny dorsal fin.
Chinook (King) Salmon: Teeth set in dark gums, with black spots on the back and both lobes of the square caudal fin.
Coho Salmon: Teeth set in light-colored gums, with black spots on the upper lobe of the slightly forked caudal fin.
Brown Trout: Distinguished by a white mouth and square caudal fin margin with no spots on upper or lower lobes.
Rainbow Trout (Steelhead): Identified by a white mouth and small black spots on back, sides, and fins.
Lake Trout: Notable for a deeply forked caudal fin and light to dark gray body with light spots.
Northern Pike & Muskellunge
Northern Pike: Features an elongated body with a duck bill-shaped, tooth-filled mouth. Its sides range from green to yellow with horizontal spots.
Muskellunge: Known for its elongated body and dark vertical bars on a green or brown background.
Fish Identification Assistance
Caught a fish and unsure about its species? Send a photo to fishid@dnr.IN.gov for identification assistance. Visit fishing.IN.gov for further details.