I assume they don't have the "2-sexes" thing going on. Maybe they're produced by a queen or something, similarly to hive insectine creatures on Earth. Or maybe they all go to the sea and produce an explosion of baby-making goo. And maybe (since I'm speculating wildly anyway), when baby Taxxons are born, there are fluids, but these fluids are specially designed to be repulsive to other Taxxons. As the baby grows, the production of those hormones or whatever would wear off.
Maybe they grow in pods! They emerge fully formed! Actually, I kinda like that one...
Hey, here's a question. Why in the world can Taxxons swim so well? I don't remember their world being described with any oceans or seas or much water at all.