closeup of an octopus in the center of the image resting on the sea floor surrounded by algae and fish

octopus underwater seabed fish sea life camouflage seaweed close portrait animal marine rocky seafood undersea algae fishing aquatic ocean cephalopod reef wildlife nature rocks tentacle mediterranean alga diving bottom fishery invertebrate creature biology ecosystem biodiversity environment natural habitat scene world fauna oceanography water oceanic zoology themes vulgaris resting closeup center floor surrounded