[2] The large-banded blenny exhibits dark coloration as a juvenile, but develops brownish to olive coloration with lighter markings, as well as a dark spot behind the eye and several broad bands from the head and fading behind the pectoral fins.

[1] The adults of Ophioblennius steidachneri are mainly found in the surge zone of exposed rocky headlands which have steep slopes where they wedge themselves into crevices near the shore in shallow water.

They feed during the day when they graze on algae and prey on sessile invertebrates by using the incisor teeth, which are similar in shape to combs, to scrape food off the rock.

Like all blennies they are oviparous, laying demersal eggs which are adhered to the substrate by a filamentous, adhesive pad or pedestal and their larvae are planktonic which are frequently recorded from shallow waters near the coast.

[2] The specific name honours the Austrian ichthyologist Franz Steindachner (1834-1919) who reported this species as Blennophis webbii in 1879.