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Big male Atlantic. Turned the wrong corner
You're right, good I.D..

Basically, you can do a count of the BASE of the anal fin rays to rule-out a salmon (chinook: 15-17, Coho: 13-15), note the sharply pointed snout, which is generally a dead give-away for an atlantic salmon over a brown trout. Spots infrequent and widely dispersed above the lateral line is an atlantic characteristic, while a brown trout from the Great Lakes has more of them that are widely dispersed, with many resembling "X" marks, The flat upper jaw maxillary bone extends generally to the back edge of the orbit, or just barely past the orbit(eye socket) on an atlantic salmon, while it extends well past the orbit on a brown trout. There is also a line of small teeth, that are quite fine that radiate down the center of the roof of the mouth on an atlantic salmon, while brown trout have generally three abreast in this line of Vomerine teeth Kype at this time of year is also an atlanttic characteristic, becoming more pronounced through time. Browns have a thicker caudal peduncle and a less forked more rounded caudal fin on the top and bottom lobes.

Hope this helps folks in future ID efforts.
 
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