Cilhi

A shoaling fish native to Uycheon III, cilhi are small marine fish that generate electrical energy and secrete a highly conductive oil which they use to resist the effects of the extreme cold common to their native climes, and weaponize against prey, injecting a small amount of the oil with a bite before zapping the victim with an enhanced electrical discharge. A single bite may simply deliver a nasty sting, but when an entire school hunts the same target, the discharge can be enough to instantly cook flesh.

A drug, Cilhi Oil, can be extracted in small quantities from the fish.