Fish Extenders are the little fish that stick out from the wall next to stateroom doors on the Disney Cruise Line.
In essence, you are extending the fish...by creating a hanging set of pockets. You then join Fish Extender groups and exchange little gifts with one another during the cruise. Groups may be found on several forums (such as DIS or Facebook, by searching for your cruise date). An organizer then oversees the creation of the groups. In general, there are groups for families and groups for just adults. Depending on how many people sign up, a cruise my have many, many Fish Extender groups going on, since most like to cap each group at about 20 or so staterooms. You get a list of names and staterooms, and then during the cruise you make your deliveries. For the most part you are expected to only do 1 gift per stateroom, and/or 1 gift per person in each stateroom.
The first thing is to have a Fish Extender to hang outside your door. This can be as simple or elaborate as you'd like. Essentially, all you need is a strip of fabric with a pocket attached for each person in your party.
Here's how I made ours...
First, I gathered some of my favorite Disney fabric.