Hello.
I used to play with Growthcraft on 1.7.10 version, when it was split by modules. I only used a few modules back then. Now I'm playing 1.12.2 and I miss the fishtraps, but the fact that it only comes with the rest of the stuff is frustrating. Could you possibly copy and paste the Fishtraps in a separate small mod?

We have released Growthcraft Trapper for 1.15 and 1.16 and should be releasing it for 1.12 soon. Of note, for 1.12 it will still be called Growthcraft Fishtrap so that it doesn't break worlds.

I'll have to revisit the code. We already have it set so that you can disable some of the other sub-mods. I'll look into this week.