Fish diurnal

Pacific Herring

Clupea pallasii

The silver pulse of the Pacific coast, these shimmering voyagers are the foundation of the marine ecosystem. Witness the spectacular arrival of the herring schools as they transform the shoreline into a flurry of life each spring.

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Quick Identification

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Size

Typically 15-25 cm (6-10 inches) in length, though they can reach up to 38 cm (15 inches) and weigh up to 0.5 kg (1.1 lbs).

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Colors

Iridescent silver sides and belly with a dark, metallic blue-green or olive back; no prominent spots or stripes.

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Key Features

Deeply forked tail fin
Large, easily detached silvery scales
Protruding lower jaw
No spines in fins
Slender, streamlined body shape

When You’ll See Them

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Activity pattern diurnal

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Peak hours Dawn and dusk (crepuscular peaks) when they rise toward the surface to feed on plankton.

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Season January to May (during spawning runs in shallow waters)

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Diet Primarily planktivorous; they filter-feed on copepods, krill, and small larval fish using gill rakers.

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Habitat Coastal waters, sheltered bays, estuaries, and intertidal zones with abundant eelgrass or kelp.

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Behavior

Pacific Herring are highly social schooling fish, moving in vast, shimmering groups that can number in the millions. This schooling behavior is a primary defense mechanism, creating a 'confusion effect' for the countless predators that rely on them for food. They are considered a keystone species because they convert tiny plankton into energy that supports whales, seals, salmon, and eagles.

During the spawning season, which typically occurs in late winter or early spring, herring migrate from the open ocean into shallow coastal bays and estuaries. This is one of nature's great spectacles, as the males release so much milt that the surrounding seawater can turn a milky turquoise color. Unlike some other migratory fish, Pacific Herring do not die after spawning and can return to breed for several years.

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Camera Tips

Capturing Pacific Herring requires a specialized approach since they are underwater residents. If your 'backyard' includes a dock, pier, or waterfront bulkhead, the best strategy is to use a submersible action camera or a waterproof trail camera mounted to a weighted PVC frame. Position the camera at a depth of 3 to 6 feet, facing toward a patch of eelgrass or submerged kelp, as these are the primary surfaces where herring deposit their sticky eggs during spawning season.

To attract a school into the frame, consider using a high-intensity green or white submersible LED light at night. Herring are phototactic and will often circle the light source, providing a mesmerizing 'silver rain' effect on your footage. Ensure your camera is set to a high frame rate (at least 60fps) because these fish move with incredible speed and agility; standard 30fps video may appear blurry during fast schooling maneuvers.

The most dramatic footage is captured during the spawning window. Monitor local wildlife reports for 'herring runs' in your area. During these events, the water becomes crowded and chaotic. Aim your camera toward the shoreline at a 45-degree downward angle to catch the interaction between the fish and the vegetation. Since the water can become murky with milt during spawning, a wide-angle lens with a short focal distance will yield the clearest results.

Similar Species

Species that look similar or are commonly confused with Pacific Herring.

Pacific Sardine

Sardines have a row of dark spots along their silver sides and ridges on their gill covers, which herring lack.

Surf Smelt

Smelt have a small adipose fin (a fatty fin between the dorsal and tail), which herring do not have.

American Shad

Shad are generally larger and have a distinct notched upper jaw and one or more dark spots behind the gill opening.

Frequently Asked Questions

Pacific Herring are most active during the twilight hours of dawn and dusk. They follow a vertical migration pattern, rising toward the surface at night to feed on zooplankton and diving to deeper, darker waters during the day to avoid visual predators like birds and larger fish.

The most effective way to attract Pacific Herring is through 'light fishing' or underwater illumination. Submersible green LED lights are highly effective at drawing in the plankton that herring feed on, which in turn brings the schools directly to your dock or seawall. Maintaining healthy eelgrass beds along your shoreline also provides the essential habitat they seek for spawning.

Pacific Herring are planktivores. Their diet consists almost entirely of tiny marine organisms, including copepods, krill, decapod larvae, and small fish larvae. They use their specialized gill rakers to strain these organisms from the water column as they swim.

Yes, if those suburban areas are located along the coast. They are frequently found in developed bays, marinas, and around private docks from California up through British Columbia and Alaska, especially during their annual spring migration into shallower waters.

While both are silvery and schooling, Pacific Sardines have a row of dark spots along their sides, whereas Pacific Herring have plain, unspotted silvery sides. Additionally, herring have a smooth gill cover, while sardines have distinct radiating ridges on their gill covers.

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