Brook lamprey are some of the most primitive vertebrates alive today and they are spawning in our river here in Rosedale right now. They are jawless, having a round sucker-like mouth and small round gill openings on the sides of the head. They have two dorsal fins and are about 15cm long. They spawn in clean gravel beds. Wonder if they know how excited Rosedale folk are about the TDY! Updale Natural History Recorder

Brook lamprey at Battlings Hill ford