Photo of Animalia: Brown Sabretooth Blenny (species: Petroscirtes lupus)

Brown Sabretooth Blenny (Petroscirtes lupus), Clifton Gardens, Sydney Harbour

© John Turnbull

Some debris is not all bad. Glass bottles, unlike plastic ones, don't break down, accumulate toxins or choke marine life. They may even provide a home, like this one with a brown blenny inside. When doing marine cleanups, it is recommended to leave bottles like this in place.

Photo taken on 15 Apr 2015