Trout are a species of wildlife in Horizon Zero Dawn commonly found in deep bodies of water, and will drop loot vital for several crafting recipes. They are most commonly found in ponds and lakes, where the water is generally slow moving.
Trout will not attack or cause any harm to the player. Unlike most other wildlife, they do not react to Aloy's proximity or attacks.
When killed, Trout will drop common items such as various types of meat but sometimes they will drop either Fish Skin or Fish Bone, both very valuable items that are useful for trading with merchants.