A #squaretail #Tetragonurus #fish pokes out from the shelter of its drifting #pyrosome colony for just long enough to get a quick shot.

#squaretailfish #symbiosis #comensalism #tunicate #tunicates #blackwater #blackwaterdiving #blackwaterphotography #chrisgug #gugunderwater #gug

A pea-sized #Argonaut #octopus hitches a ride on a chain of cloned #salps, as they drift through the open #ocean together.
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#papernautilus #nautilus #cephalopod #blackwater #blackwaterdiving #blackwaterphotography #gug #chrisgug #gugunderwater #comensalism #symbiosis