I told the Norfolk Biodiversity Information Service about it but didn't get any help with identification.
It was around 2 and half feet long
Quite girthy (thicker than my wrist)
Run over by a boat
In the River Wensum in Norwich
It's too big to be a Brook Lamprey, and seemed a little too big to be a River Lamprey. I thought it looked most like a Sea Lamprey but i couldn't find any information about them living in the River Wensum.
Can anyone tell what it is for sure?
Does anyone know the best way to destroy the rest of its kind?
Not hideous at all, perfectly natural to less limited imaginations :7
Most probably a sea lamprey, which is back in good numbers in the River Tamar in south-west England, at least. And there're enough endangered species in the world without jokes/calls for extinction as there'll be at least one other idiot reading that statement and then going out to stamp on a lamprey's head. The fish is an indicator of good water quality, and although a parasite, it seldom kills its host.
I agree with mac, & the River Lamprey is distinguished from the Sea lamprey by having a uniform colour rather than the marblings & blotchings characteristic of the s.l. ; & the dorsal fins of sea lamprey distinctly separate, as it seems the 2nd photo shows.