During an otherwise uneventful macro-dive at Silver Steps this week I looked under a small rock overhang around 8 meters deep and noticed an unusual little fish. At first glance it resembled a Tompot Blenny (see pic of a showboating individual below), only darker, more skittish and, upon closer inspection, with much smaller tentacles on top of the head. I knew this must be a Variable (or Ringneck) Blenny, Parablennius pilicornis, as we’d seen many of them on holiday on the Basque coast this summer. It is a southerly species that was first recorded in Britain in 2007 but is increasingly spotted. Not a first for Cornwall, but there are still few observations and so I have recorded it on iNaturalist (making it available for later inclusion on the NBN Atlas, the UK’s largest repository of publicly available biodiversity data). Another warmer water species joining our shores due to climate change…