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
PLANT SPECIES X!!!! Slows them right down. Put one on the back of your raft and not even the alpha can get you unless it comes from straight under. Add a ballista and a captain hat as well for added effect.
One day I went on a trip to herbivore island to get some metal I got a few storage boxes full on my raft and some in my invent. I set of home when one of these swallowed my raft, I lost all my metal and was left encumbered in the sea