Finn Lewis bought all the nearby waters and the entire Bayno Bay.
Seafood like abalone, which hardly moves long distances, was even easier. Although dealing with other kinds was a little more difficult, he managed to drive away all large carnivorous fish from these waters, and then raised an enormous and terrifying amount of seafood here.
Although 150 billion Federal coins worth of seafood might sound excessive, considering that these were highly prized species in modern society such as bluefin tuna used for farming completely sealed marine fisheries, it wasn't too difficult to reach that number. Especially considering specimens over 1000 pounds each fetching tens to hundreds of millions of Federal coins, and the heftier, high-quality bluefin tuna fetched even higher prices!