WHAT IS A FISH EXTENDER? (FE)
Outside your room onboard is a message holder, in most cases it's shaped like a fish (but can be a starfish or sea horse):
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The fish is there for Disney to place important communications to you such as excursion tickets and notes from the Cruise staff. It is like a mailbox for your room. A Fish Extender (FE) it is something that you hang off the fish, much like a pocketed organizer.
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By hanging the Fish Extender off of the fish, the Cast Members can still use it for its original purpose.
Once a cruise meet thread is up and running, someone in the group will (should?) step up and say "I'll maintain the Fish Extender exchange list". That person is the center point for all those who want to participate in the exchange. The list can be as simple as DISnames/room number/number of guests or as involved as full names/room number/ages of guests/like & dislikes/allergies/favorite characters/whatever is deemed necessary to know assemble the gifts.
Then each room on the FE list (note this will not be everyone on the Cruise Meet thread for your specific cruise), makes a Fish Extender holder.
THIS IS NOT A ONE ON ONE EXCHANGE, YOU ARE PART OF A GROUP. All the people in the exchange buy or make little items and place them in each other's fish extenders. It is great fun to come back and check the items you have received.
The most common Fish Extenders are ones that have a pocket for each person in that stateroom. Some are very fancy, some are very plain. Some are store bought, some are homemade. Search "Disney fish extender" and you will get options that range in price. You should make sure your Fish Extender is between 8" & 12"" wide. Otherwise it starts to get in the way of your stateroom door. It should not exceed 5 feet; otherwise it will hit the floor. If you are creating your own it is suggested you make the pockets a little deeper than normal too. It will keep items from falling out and keep curious hands from reaching in (average depth is 5-6 inches)but 8-11 is a better way to go if you are making it yourself
One note about the gifts, some groups set up specific delivery dates, and specify "each person gets a gift" or "only one gift per room" or (even) maximum/minimum price ranges for gifts. Other groups just say "whatever", so people can choose what/how many gifts to give. Some give individual gifts, others only one gift per room, while others might do one for the adults and separate gifts for kids. Or only gift the kids.