Eastern Atlantic: except for old citations, Parablennius ruber is only mentioned as being observed in Portuguese waters (mainland Portugal, Azores, and Madeira). This is probably due to the recent date of the revalidation of the species. An analysis of data from other populations that have been considered as Parablennius gattorugine is needed to establish the distribution of Parablennius ruber.
Inhabits rocky shores. Solitary or in groups or 5 to 15. Oviparous.
Eggs are demersal and adhesive.
Marine; demersal; depth range 2 - 20 m.