Off to one side of the Maple and Wraith market was the Fuller Fish Grill. Due to the constant open connections the Locks created and the active seeding of species such as the Makers, the Descended and recently the humans sea life was fairly consistent. Some planets had their own unique life, but the majority had things that would not have been too out of place in Earth's oceans. Making the issue more complicated was the millions of years of cross pollination and local evolution.
On some planets the earth based life had grown into things more alien than the native fauna. Such as Argos which had crab-like motile polyps. Despite their shimmering forms and triangular symmetry, they were merely an offshoot of terrestrial corals that predated on the native and less strange fish-like species. Domesticated species further blended the rules, again the various Maker designed creatures were the most obvious examples, but the Descended and the humans had their own creations.
A similar mess of deliberate planting, parallel evolution, and outright intelligent design was at work above the waves, though with less scale and time. The degree of natural spread was also greatly reduced as few air-breathing species could naturally dive down to the depth of a Lock for transit.