From Sonic Retro
Zaririn is a variety of badnik created by Dr. Ivo "Eggman" Robotnik, encountered by Sonic in the waters of Aqua Lake Zone in Sonic the Hedgehog 2 (8-bit). Resembling robotic lobsters, Zaririn models have no proactive offense; they simply swim back and forth, damaging Sonic if he bumps into them - although they tend to back up when they initially sight the hedgehog. Zaririns are easily dispatched by a spin jump.
Like other robots in 8-bit Sonic games, no animal friends pop out of Zaririns when they are destroyed. Whether these badniks canonically don't contain organic batteries, or the escaping critters simply weren't shown due to programming limitations, is not known.