These documents by Natural England provide an account of the ecological requirements of the river, brook and sea lamprey Lampetra fluviatilis, L. planeri and Petromyzon marinus, and a protocol for monitoring the species.
Ecology of the River Brook and Sea Lamprey (IN104)
Monitoring the River, Brook and Sea Lamprey (IN119)
This is part of our Good Practice Guidance for Fish, produced by Vaughan Lewis, Steve Coates and Kerry Sims.