Sea lamprey (Petromyzon marinus), classified as a non-extinct species. Usually found attached to other fish, such as trout or salmon, and occasionally caught as bycatch when anglers target other species. Sea lampreys are typically caught using fishing nets and traps. These are specifically designed for sea lamprey as they migrate from tributaries or adult lamprey when they travel back to their tributaries after spawning. Placing nets and traps in tributaries during the lamprey migration period will guarantee a few catches as lamprey have an extraordinary sense of smell they will be attracted to fresh live baits but also by other lamprey’s pheromones. A technique that has proven to be effective is using male lamprey as bait, letting their pheromone lead the other female lamprey to the trapped tributaries. Thus this process requires a few additional deflections, such as using dead lamprey and alarm cues, setting them in areas with suitable spawning habitat to warn live lamprey of danger, guiding them to the trapped tributaries. Once caught, they can be released back into the water. However, juvenile sea lamprey can cause concern if not removed or handled, as they are highly harmful to other fish during their downstream migration.