Sand Sole Identification Guide
Identify sand sole by its long thread-like dorsal fin rays, mottled brown body, and left-eyed head.
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Key identification features
- Left-eyed flatfish, unusual among fish commonly called "sole"
- Elongated, moderately deep body
- Long, thread-like anterior dorsal fin rays that extend visibly beyond the fin membrane, especially near the head
- Mottled tan-brown coloring with dark speckles and blotches scattered across the back
- Pointed snout and relatively large mouth for a sole
- Grows to about 25 inches, among the larger inshore soles of the region
Common look-alikes
- English sole has a smooth, pointed head without the filamentous dorsal fin rays that sand sole displays.
- Starry flounder shows bold alternating black-and-orange bands across its fins, a pattern sand sole lacks.
- Rock sole has a rougher-scaled body and lacks the elongated thread-like dorsal rays near the head.
Where you'll see one
Sand sole live over sandy nearshore bottoms and bays along the North Pacific coast, ranging from California to Alaska, often in shallow surf zones and estuaries where they lie partly buried in sediment waiting to ambush passing prey.
Frequently asked questions
How do I tell sand sole from English sole?
Sand sole has distinctive long, thread-like dorsal fin rays extending past the fin membrane near the head, a feature English sole does not have.
Why is it notable that sand sole is left-eyed?
Most fish carrying the common name "sole" in the Pacific are right-eyed, so finding both eyes on the left side is a quick way to rule out true soles and confirm sand sole.