Topsmelt Identification Guide
How to identify Topsmelt by its silver stripe and upturned mouth along the Pacific coast, and tell it from jacksmelt.
Read the full Topsmelt encyclopedia entry →
Key identification features
- Long, slender, slightly compressed body
- Olive-green to blue-green back with a bright silver midlateral stripe
- Small, upturned mouth adapted for picking food near the surface
- Two well-separated dorsal fins and a forked tail
- Fins mostly clear to pale yellow
- Slender caudal peduncle
- Large, round eyes suited to low-light surface feeding
- Typically 15-25 cm, occasionally larger
Common look-alikes
- Jacksmelt: grows notably larger with a longer snout and more slender build, plus more anal fin rays.
- California grunion: has a stouter body and duller coloration, and its distinctive beach-spawning behavior is a strong tell.
- Pacific sardine: an unrelated species with a deeper body that lacks the topsmelt's distinct silver midlateral stripe running the full body length.
Where you'll see one
Common in nearshore Pacific waters from British Columbia to Baja California, frequenting bays, kelp beds, eelgrass flats, and estuaries, and tolerating a wide range of salinities from full seawater to brackish lagoons and harbor channels.
Frequently asked questions
How do I tell a topsmelt from a jacksmelt at the dock?
Jacksmelt run noticeably larger and more elongated with a longer snout, while topsmelt are shorter-bodied and typically under a foot long.
What confirms a silvery baitfish is a topsmelt rather than a sardine?
Look for the bright, well-defined silver stripe running the length of the body and the small upturned mouth, both of which sardines lack.