I'm not sure if there are extremely well - known 'lava fish' specifically in science fiction. There might be some relatively unknown works that feature such a creature, but it's not a very common trope that comes to mind immediately.
I can't recall any truly famous lava fish in science fiction. There are so many different types of creatures in science - fiction universes, but the lava fish doesn't seem to be a staple. It's possible that in some small - press or online - only science - fiction stories, a lava fish has been created, but it hasn't reached the level of popularity of something like a Klingon from Star Trek or a Dalek from Doctor Who.
As far as I know, there are no widely - recognized lava fish in mainstream science fiction. However, in some indie or niche science - fiction stories, there could potentially be lava fish. These might be part of a unique ecosystem in a fictional world with extreme conditions. But overall, compared to more common science - fiction creatures like aliens or robots, lava fish are not that famous.