Yum Yum Fish are a type of fish that Marge describes as the most delicious fish in the Ocean. They are the primary source of income of the island of Barnacle Bay. The Simpsons visit the island and discover it to be desolate because they had overfished and driven all the Yum Yum Fish away. Homer accidentally burns down the boardwalk and as a punishment for burning down the boardwalk he is forced to work off the debt as a member of the crew of The Rotting Pelican. At first the crew is unsuccessful but one night Homer accidentally beer batters the hooks and as a result the crew catches plenty of Yum Yum Fish.
However, the crew are caught in a storm and their boat sinks. In the end, Lisa convinces the people of Barnacle Bay that overfishing is wrong, so the citizens turn to logging.