Welcome to the Dis Nana Ann.
We have a sub board for
Disney Cruise Meets. You can go there to find your fellow cruisers.
https://www.disboards.com/forums/disney-cruise-meets.85/
You will see at the top of that board "Find your 20XX (ship name)" threads. You can click on the thread that includes your date and ship, and then on the first page you will find the directory with all the sailings listed. If there is a link under your sailing's date you can click on that to find your fellow cruisers and see if they have a Fish Extender Exchange in the works.
If there is no link that means no one on that sailing has started a thread yet. You can start one on the Cruise Meet Board if you like or wait until someone else starts one.
If you have any questions feel free to ask.