How to fish for Brook Troutīrook Trout can be found in rivers, streams, ponds, and lakes. They also have a large mouth that extends back past the eye. Their tails are only slightly forked, which gives them the nickname of 'squaretail' in other parts of the country. They also have white margins on the leading edges of their ventral fins. Brook trout also have the unique features of red spots surrounded by blue halos along their sides and dark wavy 'worm marks' or 'vermiculations' on their backs and dorsal fins. Also, like lake trout and bull trout or Dolly Varden, their most obvious distinctive feature is light spots on a dark background, unlike rainbow and cutthroat that have dark spots on a lighter background. Brook trout can grow to 18+ inches (and several pounds) in quality populations.īrook trout are a popular and widely distributed game fish in BC and although they are called a trout, they are actually a char, closely related to lake trout and bull trout rather than rainbow or cutthroat trout.