How do lampreys attach to other fishes?

Lampreys attach to other fishes using a specialized suctorial oral disk, which functions as a sucker to create a firm grip on the host's body.12

Once attached, the lamprey uses a toothed, tonguelike structure located on the floor of its mouth to rasp into the host's flesh. To facilitate the ingestion of blood and muscle tissue, the lamprey secretes saliva containing an anticoagulant, which prevents the host's blood from clotting while the parasite feeds.2