Not sure if this mod is able to be run on a server. But It does register the catch. As I received the achievement for catching an iron crate. Although the achievement did lack the image of the crate and everything was in command brackets. The thing is, Although I got the achievement I did not get the item in question. So that makes be believe its missing in the server item library.

It could be the fact that I miss a certain mod that helps new items to get correctly implemented on the server. If that is the issue of the problem I would like to know what mod helps to have new items from other mods get correctly implemented.

If its not the case I hope that this mod would be soon made compatible with servers. Because its a really fun fishing mod.

Make sure you have the mod on the server and client. It sounds like you only have Go Fish installed on the server. If you are sure you have Go Fish installed on both sides, please send your client/server game logs through a service such as pastebin.