I suppose it's a function of the fact that Rhode Island is… well, an island… that there have been so many fishing-related Family Guy episodes. I can think of three off the top of my head, not to mention the recurring character of the Sea Captain. 

 

Nevertheless, there are so many things to do in the world, sometimes it feels a little lazy for them to keep going back to the same well. Heck, last night American Dad climbed Mount Kilimanjaro (and the artwork for that location was INCREDIBLE). But here we are on a show which is in every way inferior to American Dad, and we're fishing again.