Mod: Giants Map LS11
It seems that fish food spawns at the marina automatically. You can pick it up from the dock with the boat, or with the trailer next to the fish pickup. Salt works the same way, and can be picked up on the side of the store in the village by the marina. I would have liked a way to make my own, but at least it works. I spent hours driving all over the map looking for fish food before I found out that it spawns naturally. Also, it seems that the red wood chip conveyor doesn't work with any of the trailers that you start with.