the tendency for marine fish to refuge in natural and artificial structures underwater is well documented, but the incidence of this behaviour among predatory sharks is not widely known. a sub-adult male nursehound scyliorhinus stellaris was tracked by intermittent acoustic telemetry over 168 days in a tidal sea lough. this individual, in-between undertaking nocturnal foraging excursions, refuged in at least five different narrow-entrance holes. refuge location was validated by underwater and surface observations during which time other nursehounds (sub-adult male and female), were also seen refuging, sometimes together. this indicates nursehound display philopatric behaviour centred on aggregation in ‘home’ refuges that, in this case, were labyrinthine rock systems.