Goldfish can be obtained at level 5 Fishing.
This fish can be acquired by casting a fishing rod into bodies of water that indicate an 
Earthworm to fish at this fishing spot. Upon being caught, it gives you 20 exp in the Fishing skill.
Location
You can find Goldfish by Fishing at the Docks south of Brightleaf Forest, and inside Mushroom Island.
Recipe
Currently no recipe.