

Schools don't replace catches, they add to them. It never touches anyone's loot logic — so whatever produced your catch (vanilla, Aquaculture, a pack's custom loot table, a minigame mod that
fires the event itself) still produces it, and the school simply means more.
Verified working alongside Stardew Fishing as well.
Caveat: a fishing mod that never fires `ItemFishedEvent` at all would leave
schools inert. If that's your pack, open an issue with the mod name.