Western Fisheries Science News, January 2017 | Issue 5.1

Sea lamprey preparing a nest site in a Great Lakes tributary stream. Adult sea lamprey (and likely other species of lamprey) rely on odors released by juveniles (migratory cue) to direct them to appropriate spawning streams. Adults are later guided by odors of the opposite sex, including a male mating pheromone which attracts females and facilitates upstream movement, nest building, and spawning synchronization (Photo credit: C. Krueger, Great Lakes Fishery Commission)