[aeve890]

Not the parent comment but what's your point? You can't use that common ground for anything, let alone communication, can you?. The fish wants to fuck? You want to too, what now? How do you stablish a common ground to understanding based on such things?

[ribosometronome]

Pertinent here is that said fish has done something notable enough to have been discovered from, literally, across the galaxy. Those fish built some sort of civilization such that they're sending our lasers, radio waves, or building Dyson spheres.