Bottomfeeder;4189197; said:Nope not a Tarpon, actually a Payara, Hydrolycus scomberoides.
What size tank is this? Payara get BIG.
Not necessarily there are 4 kinds of payara and I dont think this one is a scomb
hydrolycus scomberoides
hydrolycus armatus
hydrolycus tatauaia
and hydrolycus walleci
Im 80% sure your fish is an armatus just becuse of the tail size and fin collorage but its hard to tell from the pics But I would say armatus. Also becuse its laying flat against the bottom scomb's USUALLY are at an angle.

Look at the fish in whole!