It will attacks rafts so be carful coming across one on a boat.
Also the Alpha Albino Leedsichthys Will give you raw prime fish me when you scrape meat off of it, and killing it will give you The Captains Hat Skin
When I was going to herbivore island I ran into two of these that were right next to each other. I only survived by staying next to the shore, they stay out in open water so doing this is safe. Make this higher for new players