Hi. Welcome to wetpixel.
Nice exposure, (barely blew out the white band, but saved a lot of shadow detail that way), nice focus, nice clarity.
I to like the subject and setting, but I would do a couple of things differently, for shooting.
I think it often looks better if you get down as close to even, or sometimes below, the horizontal level of the subject, so you are looking flat or up at it. The slight downward angle of your shot, I think detracts from connecting with the subject.
Also, the angle of the fish's head, is dead straight on, so you don't get any sense of a face. I generally prefer at least somewhat of an angle, of the fish more from the 3/4 front, or side...
Hope this helps.
Don