Could be wrong but to me and by all descriptions I've read it looks like a Lesser. But like said the Gill Rakes?? The main difference between the two amberjacks is the greater amberjack is longer than the lesser amberjack. In fact, the greater amberjack is four times longer than it is deep (side height); while the lesser amberjack is only about 3-1/2 times longer than deep (I tried measuring from your picture, and got a little more then 3.5 times), not counting the fins. If a ruler and calculator aren't handy and you really want to know, lift up the gill and count the finger shaped projections from the first gill. If it's a greater amberjack there are about 20 of these; in the lesser amberjack there are about 25. Also, but very hard to tell and you virtually need each side by side..Greater the dark, oblique line through the eye ends at the first ray of the dorsal fin...Lesser the line stops short of the dorsal fin. Now to remember this while trying to count Gill Rakes on a thrashing fish. .....Greateris Less...Lesseris greater...Hope this helps.First Catch (11/3/2007)Does anybody know for sure if this is a greater amberjack?
good call :clapStressless (11/5/2007)If you kept him and ate him it was a Greater AJ.
If you threw him back and he got ate by a damned dolphin it was a Greater AJ
If you counted gill rakers poked around under the gill covering with bacteria covered fingers it was a Greater AJ
If you took higher calculus and measured the angle of the inflection point from the soft dorsal ray it was a Greater AJ
If you said - "This fish isn't 28" and I don't want to kill it without knowing for sure what it is.." you tossed back a Lesser AJ and should still feel good about it.