Atlantic. Adipose clip, USGS Tunison Labs stocked fish or possibly Ontario stocked as they are now using the same clip as Tunison Labs which confuses the issue. Note mouth does not extend past the back of the eye where brown trout mouth will extend past. Spotting can vary greatly on both species but lack of spots below the lateral line and on the gill plate on this fish points to Atlantic. Although the caudal peduncle and caudal fin cannot be seen completely in the photo the caudal peduncle looks narrow like an Atlantic. If in doubt for future reference look at the roof if the mouth. Atlantics will have one row of vormerine teeth, brown trout two rows.