Blue-banded Goby

Lythrypnus dalli

The blue-banded goby (Lythrypnus dalli), also known as Catalina goby, is a strikingly colorful small fish native to the eastern Pacific from Morro Bay, California, to the Gulf of California. Adults reach only 2.5 cm in length, making them one of the smallest vertebrates in their range. Their vivid appearance features a bright red-orange body adorned with iridescent blue vertical bands, typically numbering four to nine. These tiny gobies inhabit rocky reefs, boulder fields, and crevice-rich areas where they perch on rock surfaces using their fused pelvic fins as suction discs. They are sequential hermaphrodites, typically female-first, with dominant individuals transitioning to male when the social hierarchy demands. Blue-banded gobies are territorial and defend small areas of rock face. They feed on tiny planktonic organisms and small invertebrates. Despite their diminutive size, their brilliant coloration makes them highly sought-after subjects for underwater macro photography. They are found at depths ranging from 2 to 80 meters, though most commonly between 5 and 25 meters on rocky substrates.