Brother David has a large collection of skulls, most of which have been obtained as a result of road kill over the past >50 years.
Today he sent me a photograph of the head of a rather decomposed pike that he had spotted adjacent to Hanningfield Reservoir. He has placed a plastic ruler beside it: the head measures 23cm from gill cover to snout. He estimates that it weighed in excess of 30lb at one time. It's comparable in size to a pike's skull that he already has in a display cabinet in his dining room. That was an Abberton pike, obtained when he was still a water company chemist with duties that took him around the place taking samples, and zoological specimens, on a regular basis.