Pacific Herring Identification Guide
Learn to identify Pacific herring by its slim silver body, single dorsal fin, and spotless, moderately keeled belly.
Read the full Pacific Herring encyclopedia entry →
Key identification features
- Slender, laterally compressed body with a blue-green to olive back and bright silver flanks
- Single soft dorsal fin positioned at the midpoint of the back, with no spines
- Deeply forked tail and a row of scutes along the belly that is only moderately keeled, less sharp than in menhaden
- Sides are plain silver with no dark spots or blotches
- Adults typically 15-30 cm, with large, easily dislodged scales
Common look-alikes
- Pacific sardine — shows one or more rows of dark spots along the flank and a slightly more pointed head, both absent in this species
- Northern anchovy — has a pointed, overhanging snout and a much larger mouth reaching well past the eye
- Pacific menhaden (Ethmidium) — deeper-bodied, larger-headed, and marked with a row of dark spots this herring lacks
Where you'll see one
Pacific herring range along the North Pacific rim from California to Alaska and across to Japan and Russia, schooling in nearshore coastal waters and spawning in shallow bays where they deposit eggs on eelgrass and kelp.
Frequently asked questions
How do I tell Pacific herring from Pacific sardine at a glance?
Check the flanks for spots — sardines usually show a row of dark spots along the side, while Pacific herring have plain, unmarked silver sides.
What separates Pacific herring from northern anchovy?
The snout and mouth are the giveaway — anchovy have a pointed, overhanging snout with a mouth extending past the eye, while herring have a blunter head and a smaller mouth.