alive octopus underwater swimming in the aegean sea

underwater reef sea sports fish ocean coral recreation swimming animal aquarium organism alive octopus aegean oktopus vulgaris mediterranean beneath posedonia algae aegean sea algae alive animal animals wild behavior blue camouflage cephalopod change close up colorful common octopus dive ecology environment exotic fish greece ikaria intelligent invertebrate kraken life live marine marine fauna mediterranean nature ocean pulpo real research snorkeling surface swim tentacles undersea undersea underwater vulgaris water wildlife