Sea anemone and isoginchaku-ebi living in them. You would expect to see lionfish much further south than here in the lower part of Tokyo Bay. Sea hare in sludge. They like muddy bottoms, and have been increasing recently. These Mediterranean green crabs are native to the Mediterranean Sea.
Many creatures hitch a ride on foreign vessels, then decide to stay in Tokyo Bay.
Common octopuses caught in Tokyo Bay have long been considered a delicacy. Sanban Shoal at the head of the bay is a paradise for wild birds, but there are plans to cover it over to make new land. Anahaze adapt well to human environments, and are now proliferating in the inner arc of the bay. Perhaps they are glad that Tokyo Bay has lots of garbage. Perhaps they are glad that Tokyo Bay has lots of garbage.