Brook trout (Salvelinus fontinalis) has red spots with blue halos along its sides. Also, there is a worm-like pattern along the ridge of its back.
Brown trout (Salmo trutta) has the front edge of its fins white or lighter in color. Also, it has dark spots, few or none on its tail.
Rainbow trout (Oncorhynchus mykiss) has dark spots, especially on its tail, and a pink lateral stripe.
GOLDEN RAINBOW TROUT
Golden rainbow trout (Oncorhynchus mykiss) has red deep-yellow or orange coloration. Some have a darker gold stripe..
Lake trout (Salvelinus namaycush) has light spots over its entire body. Its tail is deeply forked.