The brown trout (lat. Salmo trutta) is a European species of salmonid fish that lives mainly in streams, lakes, and rivers, while it migrates to the sea where it spends quite long periods of time.

It is a medium-sized fish that weighs about one kilogram and has an average body length of 60-70 cm. Its color varies from gray-blue to brown and silver, with characteristic dark spots on the back and with a lighter shade on the sides. The brown trout typically has a largemouth. It is generally considered an omnivorous fish, feeding on a wide range of species from plankton to insects and other fish.