Great shot.... is it a bass or a mullet?

I occasionally look at this website/blogsite as the guy has some fantastics shots. See this one.

http://johnsmyth.ie/blog/2009/05/10/dolphin-makes-a-kill/#more-1222

Look through the archives and on the older site.

or Sea Trout? Hard to tell.

Looks like a sea trout, the tail is square from what I can see on the picture, a salmon would have a concave shaped tail.
Differences between Salmon & Sea Trout: http://www.seatroutfishing.net/fish%20ID.htm

Me eyesight not great but it looks like a dolphin to me.

defo a sea trout alright..great pic