which is the Atlantic Salmon, which is the Sea Trout ?
for me, the simplest method is to compare tails, markings around the lateral line and specially the corner of the mouth/eyeball relationship. this latter seems to be among experts the more sure-fire method as markings and fin shape may vary.
– salmon don’t have dots below the lateral line, have a pointed concave tail and the corner of their mouths stops around the center of their eyeball.
– the spots on brown trout extend below the lateral line, their tails are either flat or a ’rounded-off’ concave and the corner of the mouth extends past the eyeball. simple !