N. polystigma can be found in groups (20-50) or singly. When in groups, they cruise through habitats like a pack of ravening wolves, devouring anything edible. When alone, they hunt like N. livingstonii, by feigning death but does not lie on its side like N. livinstonii. Sexually active males turn dark blue, completely obscuring their blotched pattern. Sexually active males refrain from feeding while in their blue dress, but instead actively defend their spawning site. It is hypothesized that with their blue coloration, they are unable to employ their hunting technique because they've lost their camouflage.