Armatus:
Red/orange adipose fin
black slash behind gill plate
white edged caudal fin
clear caudal fin base turning to black
extensions in center of tail fin (larger individuals)
swims at a level swimming angle
larger jaw
down turned head
Scomb:
Black adipose fin
black blotch behind gill plate
black caudal fin base turning to clear
no extensions in caudal fin
smaller jaw
upturned head
swims at a slightly head down angle (most of the time)
more pronounced hump behind head
These are some of the things i have noticed between my payaras. Also the two behave differently. Also, in larger fish 6in and up, the arm tends to have a goldish colored head while a scomb is a more darker silver color. Anyone else notice more things different between the two?
p.s. Great Idea rumblesushi!