Fish Active during the day

Striped Killifish

Fundulus majalis

iNaturalist Wikipedia

The Striped Killifish is a resilient icon of the Atlantic coast, known for its striking patterns and incredible ability to survive the toughest tidal environments. A favorite for coastal observers, these hardy fish bring a flash of silver and shadow to every salt marsh and estuary.

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Quick Identification

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Size

4 to 7 inches (10 to 18 cm) in length; weighs approximately 0.5 to 1.5 oz (14 to 42 g)

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Colors

Silvery-white belly with olive-green or grayish backs; females have 2-3 black horizontal stripes, while males have 15-20 vertical black bars

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Key Features

Distinct sexual dimorphism with horizontal stripes on females and vertical bars on males
Large, prominent eyes and a flat-topped head
Upturned, protractile mouth for surface feeding
Stocky, cylindrical body tapering at the tail

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 8 AM - 6 PM, heavily influenced by high tide cycles

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Season April-September

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Diet An opportunistic omnivore that feeds on small crustaceans, mollusks, polychaete worms, and insect larvae, supplemented by algae and detritus.

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Habitat Shallow coastal waters, salt marshes, estuaries, tidal creeks, and sandy shorelines.

public Geographic range

Where Does the Striped Killifish Live?

The Striped Killifish is a native fixture of the North American Atlantic coast. Its range stretches from the southern waters of New Hampshire down through the entire Eastern Seaboard to the tip of Florida. It also maintains a strong presence along the northern Gulf of Mexico, inhabiting the brackish lagoons and coastal marshes from Florida's west coast over toward Texas.

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2 Countries

1.2M km² Range

Least Concern Conservation

US United States

Marginal

MX Mexico

Marginal

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iNaturalist / Verified observation data

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Behavior

Striped Killifish are energetic, social fish that are almost always found in schools, ranging from a few individuals to several hundred. They are master survivors of the intertidal zone, possessing an incredible tolerance for fluctuating salinity and low oxygen levels that would drive away most other fish. They are frequently seen patrolling the very edge of the waterline, moving in and out with the tides to access nutrient-rich marsh surfaces.

One of their most remarkable behaviors is their ability to escape drying tide pools. If the tide recedes and leaves them stranded, the Striped Killifish can use its muscular body to flip and jump across mud or wet sand for several feet to reach open water. They are diurnal and spend most of their daylight hours foraging, often hovering just below the surface to snatch floating insects or dipping into the substrate for small crustaceans.

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Camera Tips

Capturing the Striped Killifish on camera requires an underwater setup, such as an action camera in a waterproof housing or a specialized submersible trail cam. For the best results, place your camera in a shallow tidal creek or a permanent tide pool at low tide, aiming the lens horizontally toward a clear, sandy patch. Ensure the camera is weighted or staked down, as the incoming tide creates strong currents that can easily sweep away lightweight equipment.

To attract a school into the frame, use a small mesh bait bag filled with crushed blue crab, shrimp, or even bits of oily canned fish like sardines. Secure the bait about 10 to 15 inches in front of the lens. As the tide rises, the scent will draw the killifish in from the surrounding marsh. They are curious and competitive, so a single bait source often results in high-energy schooling footage with plenty of movement.

Lighting is your biggest challenge underwater. Try to position your camera so the sun is behind it or directly overhead (midday is best) to illuminate the fish's silvery scales and make the black stripes pop against the background. If you are filming in a salt marsh with heavy vegetation, look for 'gaps' in the seagrass where the fish naturally congregate to move between feeding grounds.

Similar Species

Species that look similar or are commonly confused with Striped Killifish.

Mummichog

Mummichogs have a more rounded, blunt snout and lack the distinct horizontal stripes found on female Striped Killifish.

Rainwater Killifish

Much smaller (rarely exceeding 2 inches) with a more translucent body and lack of distinct bold stripes or bars.

Sheepshead Minnow

Has a much deeper, diamond-shaped body profile compared to the slender, torpedo shape of the Striped Killifish.

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Frequently Asked Questions

Striped Killifish are primarily diurnal, meaning they are active during daylight hours. However, their activity is also dictated by the tides; they are most active during the rising tide when they can move into newly flooded areas to feed.

If your property borders a salt marsh or tidal canal, you can attract them by maintaining a natural shoreline with native marsh grasses. Providing small amounts of fish-safe bait like crushed local crustaceans in a mesh bag can also draw them to a specific spot for viewing.

They are opportunistic feeders with a diet consisting of small shrimp, crabs, insect larvae, worms, and occasionally algae. They often feed by picking through the sand or snapping insects off the water's surface.

Yes, they are very common in suburban coastal areas, particularly in man-made canals, under boat docks, and in any brackish water drainage systems that connect to the ocean.

The easiest way is by the markings. Female Striped Killifish have long horizontal stripes, whereas Mummichogs typically have vertical bars or a more mottled, muddy appearance. Striped Killifish also have a more pointed snout and a longer, more slender body shape.

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