http://en.m.wikipedia.org/wiki/Cynoscion_nebulosuscheck the dorsal fins of your catch, there's a second one between the front dorsal fin and the tail, this is this major difference between a sea trout and a sea-going brook trout......the later only has an finger-like adipose liked all salmonoids ....
there are sea-going brook trouts which ha've silvery appearance oppose to the resident brook trouts, but they still have the adipose...
sea trouts do not belong to the trout family, they in fact belong to the drum group of fish