Niron is an toy produced by Wolfu.
Designed in 1981 by Shao Ching Lan, it was an major success due to the "perfect emulation" of fish life, as it can eat, swim in a bowl, and it was needs before it dies.
Shao Ching Lan said "it's not a fish!" after several theories about this on YouTube.
and then "it's supposed to emulate one, but not exactly be an fish.