At the summer event back in June, the pond dipping was great fun as always. My favourite find was this bullhead lurking in the mud. It’s perhaps 7cm long and quite chunky with a great big head, hence the name bullhead, and the alternative name miller’s thumb.
They tend to live at the bottom of fast flowing stony rivers, feeding on invertebrates at dusk. They are very well camouflaged – unless you stick them in a white tray of course.