Humanity's relationship with clay is ancient, back when animals were naturally our companions in this mystery. It's very possible if you were outside harvesting clay from a creek bend 20,000 years ago, some of these very same fish might have been watching you.
With a few years of research, I created this fish website where you may become enlightened to the many beautiful fishes of the backwater streams across the world, as well as the primary aquaculture data if you wish to keep them: https://www.freshwaterfishkeeping.com/