Brown trout Brown (or Brooke) Trout belong to the trout family. The color of this beautiful fish is very different. Red spots can be found among a number of brown flecks in different sizes on the head, gills and back. The back is a greenish brown color, the stomach ranges from yellow to white. The body has a torpedo-like form. The mouth opening reaches back behind the eyes. The tail fins are somewhat indented but they are straighter on older fish.