The Brook Silverside (Labidesthes sicculus) is a slender, silvery fish that inhabits freshwater lakes and streams. It typically measures between 3 to 5 inches and is known for its iride... The Brook Silverside (Labidesthes sicculus) is a slender, silvery fish that inhabits freshwater lakes and streams. It typically measures between 3 to 5 inches and is known for its iridescent body and high, forked tail. Brook Silversides are fast swimmers and feed on small aquatic insects and plankton. They are often found in schools near the surface, where they can escape predators.Click here to read more about Brook Silverside.