White-spotted greenlings are mostly brown with dark bars across their body. Close inspection reveals how they received their name: they are covered in tiny white spots. This greenling enjoys areas with rocky outcrops or other protective structures and eelgrass beds. Like most other greenlings, these fish eat marine invertebrates and small fish.
The male white-spotted greenling will guard eggs left behind by a female through the winter. Intruders who approach the eggs too closely may be bitten.