Good photo, but what is it?

[Rhone Man]

This fish that buzzed us a few times on a Caribbean dive was nearer 5 foot long. I initially thought it might be a tarpon (but it clearly isn't). It moved a lot like a shark (but also clearly isn't). Is it a cobia?

 

[Rhone Man]

Tried to upload a bigger image, but didn't really work...

 

[Scuba Monkey]

Based on the size and the general shape, I'd say it's an amberjack, Seriola dumerili. I think the tail having one lobe larger than the other is just from the angle of the photo.

 

[Rick Murchison]

That's a Ling (Lemonfish, Cobia... Rachycentron canadum).

Rick

 

[EastEndDiver]

The fin and tail structure makes it look more like a "Greater Amberjack" (Seriola dumerili) to me.

 

[Jax]

Cobia

Amberjack

 

[ScubaSteve]

Jack was the first thing I thought......the face looks to stumpy to be a ling does it not? I am far from a fish expert though

 

[ryan115]

I am with Rick 100%
Cobia R. canadum
based on Pigmentation, caudal shape, dorsal and anal shape, head profile

 

[Rhone Man]

The one thing that really made me think "Cobia" was that people say that Cobia are often mistaken for sharks (despite not looking much like sharks). This fish definitely moved like a shark.

I am just glad no one had a spear gun, because at that sort of range I am sure someone would have been tempted to take a pop, and probably would have had a wild ride...