yestoday i found and tested a afk fishing farm that works on the server, so i'll share.
the vids i used, in order:
https://www.youtube.com/watch?v=aezeY1TCj0M (https://www.youtube.com/watch?v=aezeY1TCj0M)
https://www.youtube.com/watch?v=uag73pKifBo&feature=youtu.be (https://www.youtube.com/watch?v=uag73pKifBo&feature=youtu.be)
the fishing rod dispenser can just be ignorere. if you have eny problems getting the design right, then i have a working one to look at at my place. if you are not that good at redstone or just rather wanna spend your time on something else, then i'll gladly come build it for your nearly free, as i may need some building materials.
Bisnisman bob! ;) 8) 8) 8)