Need Assistance ID'ing fish!

Hi People,

I've been hunting unsuccessfully for a picture of a fish I saw snorkelling
off Grand Cayman. Various suggestions haven't matched yet...

I was only maybe 100yrds off the coast, snorkelling around some coral and
enjoying the usual little fish when this mammoth thing caught my eye.
The water was only about 8-10ft deep, but I got the impression he was
wandering around and was on the way out. It was maybe 10-20 ft in front
of me (visibility being superb), and judging by the stingray that also
wandered into the field of view (the second brown-pants moment) it must
have been 4-5 ft long.

It was silver scaled, "normal" fish shaped in my amateur opinion (i.e. no
lumpy head, stumpy body, long fins or jutting jaw) with the exception that
I remember the eyes looked especially large. Maybe 2 inches across? It
was alone and seemed to take note of me but only so as to swim nonchlantly
in the other direction! Thankfully.

I'm pretty sure it wasn't a Barracuda (too "tall") or tuna (too thin,
width wise). It may have been a large Tarpon but I'm not convinced it had
a down-sloping mouth (it was more horizontal) and the eye was more central
in the head, not as far forward or high. Some pictures of Jewfish look
close but again te mouth doesn't look right. The Tarpon is the closest
match so far though.

http://www.flmnh.ufl.edu/fish/Galler...on/Tarpon.html

If anyone can come up with some options and pictures I'd be most grateful
) I've gone through entire lists of fish that are supposed to be around
Grand Cayman and not found it yet. It was damned impressive though, not
something I'm going to forget in a hurry! I'd just like to be able to
give it a name. I have no memory of fin size/shape/location sadly. Not
being a fisherman I wasn't looking to ID it that way...but I'm pretty sure
I'd recognise it from a picture/video. It's quite likely to be a
deeper-water fish, since there is quite a steep drop-off from the shores
of the island.

Cheers

Bennett