This story reminds me of a similar story. One from the Arctic Coast. A bowhead whale carcass had run up the beach, west of Paulatuk on the Arctic Coast. Many grizzly bears had congregated there. And the story goes that they were all so well nourished, that they appeared almost 'drunk', and in a stupor, so fully satiated as they were. You can bet that their upcoming winter sleep was rather comfortable - at least from that perspective.
This story of the sharks is equally amazing, many individuals gorging themselves, a veritable feast, Smörgåsbord like, all at will.