Stop: Portland Fish Exchange Visit the Portland Fish Exchange, one of the only remaining working fish auctions in the United States. On auction days, you may witness the fast-paced sale of fresh catch as fishermen and buyers move through the process in real time. On non-auction days, you’ll still get a behind-the-scenes look at how seafood is landed, handled, and prepared for market, along with insight into the systems that keep Portland’s fishing industry running. Stop: ISF Trading Step inside ISF Trading, a working seafood processing facility, for a hands-on look at where some of Maine’s freshest seafood is prepared and distributed. During your visit, you’ll sample a selection of fresh, raw seafood while learning about sourcing, seasonality, and what makes Maine seafood so highly regarded.