Fish diurnal

Atlantic Capelin

Mallotus villosus

The silver pulse of the North Atlantic, Atlantic Capelin are small forage fish that transform entire coastlines into shimmering spectacles during their legendary beach-spawning 'rolls.'

0 Sightings

0 Habitats

Quick Identification

straighten

Size

Males reach 20 cm (8 in); females reach up to 25.2 cm (10 in)

palette

Colors

Olive-green or translucent dorsal side shading to brilliant silver flanks and a white belly; males turn reddish-iridescent during spawning

visibility

Key Features

Slender, elongated body shape
Olive-colored back with shimmering silver sides
Males develop prominent 'hairy' lateral ridges during spawning
Deeply forked tail fin

When You’ll See Them

schedule

Activity pattern diurnal

brightness_5

Peak hours Daylight hours for feeding; tide-dependent (any time) for spawning

calendar_month

Season June-July

restaurant

Diet A planktivore that filters the water for copepods, krill, and other small crustaceans.

park

Habitat Open ocean (pelagic) waters; sandy or gravelly beaches during the spawning season.

bar_chart
Loading activity data...

Behavior

Atlantic Capelin are the essential 'forage fish' of the north, acting as the primary energy link between plankton and the ocean's great predators. They spend most of their lives in massive, coordinated schools that move like a single organism to confuse predators. These schools follow the retreat of the ice shelf in the summer, grazing on nutrient-rich swarms of krill and copepods in the frigid Arctic and North Atlantic waters.

Their most famous behavior is the 'capelin roll,' a dramatic mass-spawning event. Millions of fish migrate to coastal beaches, where they use the surf to reach the shoreline. The males are particularly aggressive during this time, often beaching themselves entirely to ensure their eggs are fertilized in the sand. This high-energy event is so taxing that nearly all males die shortly after spawning, providing a massive nutrient boost to the coastal ecosystem.

While they have no direct social interaction with humans, their arrival on coastlines is a celebrated seasonal event in places like Newfoundland and Iceland. They are a keystone species; when capelin populations fluctuate, the health of entire populations of cod, whales, and seabirds follows suit.

photo_camera EverydayEarth exclusive

Camera Tips

Capturing the 'capelin roll' on camera requires a specialized setup compared to typical land-based wildlife photography. Because these fish wash up right at the water's edge, the best approach is to use a waterproof trail camera or an action camera mounted on a low-profile, weighted tripod. Position your camera at the high-tide mark, facing parallel to the shoreline rather than straight at the water. This angle allows you to capture the depth of the school as it hits the sand. If you are using a standard trail camera, ensure it is in a protective housing, as saltwater spray is highly corrosive.

Since the action is incredibly fast-paced, set your camera to high-speed trigger mode or video mode. A 20-second video burst is far more effective at capturing the 'boiling' water effect of a capelin school than a still photo. If your camera has a time-lapse setting, use it during the two hours surrounding high tide. This is when the fish are most likely to 'roll.' Monitoring local water temperatures is also key—capelin typically wait for the water to hit between 6°C and 10°C before they begin their shoreward rush.

Lighting can be a major challenge on a bright beach. If you're filming during the day, the reflection off the wet sand can wash out the silver scales of the fish. If your camera allows for it, a circular polarizing filter will help cut the glare. For nighttime spawning events, use a 'no-glow' infrared flash. This will allow you to capture the capelin without scaring away the nocturnal predators—like foxes, bears, and gulls—that come to the beach to scavenge the dying fish. This 'predator-prey' interaction makes for some of the most compelling footage you can get on a coastal camera trap.

Similar Species

Species that look similar or are commonly confused with Atlantic Capelin.

Atlantic Silverside

Smaller with a much more pronounced, sharp silver lateral line and a more slender snout.

Rainbow Smelt

Found more often in brackish or fresh water and possesses much larger, more visible teeth than the capelin.

Frequently Asked Questions

Atlantic Capelin feed during the day, but their spawning activity is controlled by the tides. They are most active on beaches during the two hours surrounding high tide, which can occur during the day or night.

You cannot attract them with food, but if you live in a coastal northern region, you can find them by monitoring local 'capelin alerts' and water temperatures during early summer (June and July).

They are primary consumers that eat zooplankton, specifically copepods and small krill, which they filter from the water as they swim.

They are only found in coastal suburban areas in high-latitude regions like Newfoundland, Canada, or parts of Scandinavia, where they wash up on local beaches during spawning.

Atlantic Capelin are larger and have an olive-green back, whereas Silversides have a much more distinct, mirror-like silver stripe running down their side and a pointier head.

Record Atlantic Capelin at your habitat

Connect a camera to start building your own species record — AI identifies every visitor automatically.

Join free Identify a photo