I've seen a picture of a hallibut that was 11 feet long and weighed over 1500 pounds. It was commercially caught by a sein net in Alaska by a boat that was netting a school of chum salmon. The halibut was swimming through the school gorging itself. When it was brought on board, the halibut was full of chum ranging from 11 - 15 pounds apiece. The picture showed the fish laying on the deck and it was thicker than the height of the boots that the deckhands were wearing.