Lampreys have a skeleton made of cartilage and
a long, tube-shaped body. They have seven gill openings
on each side of the head. These animals lack pectoral
and pelvic fins, have only one nostril and no jaws.
Some lampreys do not feed as adults while others
act as a parasite on fishes, attaching with their
mouth and scraping flesh and fluids with the teeth
on their tongue and oral disc. There are no scales
on the body. A larval lamprey is known as an ammocoete.
Ohio lamprey--Ichthyomyzon bdellium [extirpated]
chestnut lamprey -- Ichthyomyzon
This parasitic lamprey requires two to three years
to complete its larval development. Adults live
about 18 months but feed actively for about only
five months near the middle of the adult life span.
Found in lakes and streams, the adults ascend streams
to spawn. Adults may reach 15 inches in length.
northern brook lamprey--Ichthyomyzon fossor [state
silver lamprey--Ichthyomyzon unicuspis
least brook lamprey--Lampetra aepyptera [state threatened]
American brook lamprey--Lampetra appendix
sea lamprey--Petromyzon marinus [nonnative]