Department of Natural Resources
Anglers on the Great Lakes have the opportunity to catch a variety of fish species - including many different salmon and trout. Often times these species can look very similar to one another. Below are some tips for identifying the most commonly caught Great Lakes salmon and trout species.
Two dorsal fins including one adipose fin (unless clipped), and 45 to 49 caudal peduncle (base of tail) scales. Caudal peduncle (base of tail) is generally narrow and tapered. Adults sometimes have X-like black spots on sides, mostly above the lateral line. Narrow pointed, vomerine tongue with four to six small teeth. Protrusion of upper lip usually extends to rear edge of eye or only slightly beyond. Dark pectoral fins, caudal fin (base of tail) may be slightly forked and nine or 10 rays in anal fin.
Atlantic salmon are often misidentified, often as Chinook salmon or brown trout. Below are some additional photos which can help show the difference.
Two dorsal fins including one adipose fin (unless clipped), inside the mouth and games are black, small spots on upper back and tail, 15 to 17 rays in anal fin.
Two dorsal fins including one adipose fin (unless clipped), dark blue to green back with silver sides, white belly, wide caudal peduncle (base of tail). Inside of mouth is white and gums between teeth gray or white, but tongue may be black. Small dark spots on back, sides and typically on upper lobe of caudal fin (base of tail). Thirteen or more rays on anal fin.
Two dorsal fins including one adipose fin (unless clipped). Mouth and gums are light, small spots along rays on entire tail, 10 to 12 rays in anal fin.
Dorsal and adipose fin (unless clipped), broad square tongue with 11 to 12 large teeth, light pectoral fins, square tail and nine to 10 rays in the anal fin.
Illustrations courtesy of Joseph R. Tomelleri and copyrighted.