Of all the animals ye may happen upon, this one is by far the sharpest. Own a subscription that runs through May, or make a purchase of $9.99 or more this month to receive an Triketos Plushie to spear any unwanted boarders on yer ship. Unfortunately both the trident and arrows are stuffed which makes them a bit less effective.
If yer still lookin’ fer a fight, try trackin’ down some kings. Earn the May Seal o'Piracy by engagin’ in sea melees with 3 Brigand Kings. Be careful, they won't take it easy on ye.