It looks like a halibut to me...I might be wrong, it might be a flounder.
I don't think Gary is going to answer you. He has not made a post for almost 3 years. In fact this photo was posted on the same day Gary posted his crab photo. He has never made another post since...It is a shame because he is a bloody good photographer !!
If you do happen to read this Gary, you are more than welcome to post photos (and comment on the Forum) and I give you my personal assurance that you will not be attacked by anyone.