I have the datapack loading done through kubejs as you can see here.

Changing the values for the unusual fish mod works as intended, but it seems as though aquaculture fish are using SF's default data rather than what's here. Not sure if it's user error or something else going on.

I am about to release a 3.0 update for Stardew Fishing, and it's likely that your issue might be fixed since I changed a decent amount of the fish behavior loading code. I'll let you know here when that's out and if it doesn't fix your issue, then I will look into it.

Thanks for all your hard work on both the issues I submitted! The 2.0 update has been such a huge boon to the mod and made Sunlit Valley way more fleshed out

Glad to hear it! 3.0 has been delayed a bit due to some newly planned features, just so you know.

Actually I just had an idea: if you add "replace": true to the data.json at the top level, that should fix it. That being said, there are some bugs in the current version that may cause this to not work properly.

Meant to follow up on this but I forgot 💀

Replace: true does indeed work as it should, my mistake for not realizing about basic datapack features!