Woolly Sculpin

Fascinating facts about the Woolly Sculpin

• In 1858 French ichthyologist Charles Frédéric Girard first described this fish under a different genus, noting that its anal fin starts behind the second dorsal fin, a quirky anatomical clue that still sparks debate over its true family ties. It shows how a single observation can ripple through taxonomy for centuries.
• Reaching up to 18 cm long, this scaleless fish hides a pair of sharp spines at the end of its large spine, each fin bearing 12 to 15 rays, giving it a miniature armor that lets it thrive on rocky intertidal beds. Its built-in defenses let it linger where many predators cannot reach.
• Able to gulp air and survive out of water for as long as 24 hours, it can hop between tide pools when the tide recedes, turning a perilous dry spell into a feeding opportunity. This breath-holding skill rewrites what we think marine fish can do on land.
• Each female lays several batches of 50 to 1,300 eggs, each 12–25 mm in size, and the hatchlings grow to 50–60 mm within a few months, an astonishingly fast start that fuels the seasonal boom in their numbers each spring and summer.
• Its blood runs green, thanks to biliverdin tightly bound to proteins.

At a glance

About the Woolly Sculpin

The woolly sculpin (Clinocottus analis) is a strikingly speckled fish that reaches up to 18 cm, its elongated, scaleless body ending in a broad, flattened head crowned by eyes perched atop the skull. Its mouth yawns wide, packed with numerous teeth, while its dorsal, anal and caudal fins each have 12-15 rays and the caudal fin is rounded and darker than the rest of the body. It can shift its mottled green, greenish-black, brown and reddish speckles to blend with tide-pool algae and rock. It inhabits the intertidal seabed along the California coast down to Baja California, favoring sand, small rocks and bedrock in waters from 6 °C to 22 °C, often no deeper than 18 m. Remarkably, this sculpin can breathe air and survive out of water for up to 24 hours, a trait that lets it wander between tide pools at will. Its diet includes light-colored crustaceans, especially amphipods, fish eggs, larvae, polychaetes and molluscs. Non-migratory and adept at camouflage, the woolly sculpin is preyed upon by great blue herons, snowy egrets and willets, and it has green blood plasma tinted by biliverdin-protein complexes.

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