River lamprey  (Lampetra fluviatilis)

River lamprey larvae

© Michel Roggo / naturepl.com

River lamprey

© Pat Morris

River lamprey

© Pat Morris

River lamprey sucker with disk-shaped mouth, captive

© Michel Roggo / naturepl.com

Female river lamprey attached by its jaw sucker to a stone

© Willem Kolvoort / naturepl.com

River lamprey in shallow water

© Raymond Tolfsen

River lamprey

© www.osfimages.com

River lamprey in hand

© Raymond Tolfsen

River lamprey in hand showing underside colouration

© Raymond Tolfsen

Lamprey attached to trout

© www.osfimages.com

River lamprey damage on salmon tail

© Niall Benvie / www.osfimages.com

River lamprey looking for a mating place in brook

© Willem Kolvoort / naturepl.com

River lamprey pair preparing to mate

© Willem Kolvoort / naturepl.com

River lamprey pair mating

© Willem Kolvoort / naturepl.com