Hi! There's an unofficial update that is compatible with the current version of SMAPI and SDV
here. To make compatible with mods such as Stardew Valley Expanded and More Fish (or any other mod that adds new fish into the game), load a game with all fishing mods installed, then go into the Teh's Fishing Overhaul mod folder, delete the fish.json and fishtraits.json files and press F5 to reload the mod, it will then update the mod with the modded fish instead of the default fish. If there's any errors (I've gotten a weird error where I started catching cooking items while fishing for some reason) just repeat the same process once or twice and you should be able to get it working.