When I last went mackerel fishing in PEI, the captain offered to clean our catch as part of the cost. He did so at the back of the boat.
Two things I can say about PEI seagulls:
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They are huge compared to the inland seagulls in Ontario. Seemed like twice the size.
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They are aggressive AF, landing on the edge of his cutting board to swipe fish parts. Risking a slice or stab from the captain. Ontario gulls will pace and stare and squawk near chip trucks and such, but never get close enough to stab.