Fish Active at night

Flathead Catfish

Pylodictis olivaris

iNaturalist Wikipedia

The undisputed heavyweight of the river bottom, the Flathead Catfish is a master of ambush and underwater shadows. With its distinctive shovel-shaped head and solitary nature, this apex predator offers a fascinating glimpse into the hidden depths of North American waterways.

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Quick Identification

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Size

Typically 38–114 cm (15–45 in) long and 5–20 kg (11–45 lbs), though trophy specimens can reach 155 cm (61 in) and over 55 kg (120 lbs).

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Colors

Mottled yellow-olive, olive-brown, or dark brown on the back and sides, fading to a pale yellow or creamy white belly.

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Key Features

Broad, flattened head with a protruding lower jaw
Squared-off or slightly notched tail fin, never deeply forked
Small, beady eyes positioned on the top of the head
Prominent sensory barbels (whiskers) around the mouth

When You’ll See Them

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Activity pattern Active at night

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Peak hours 9 PM - 4 AM

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Season May-September

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Diet Strictly carnivorous; they prefer live prey including sunfish, carp, bullheads, and crustaceans, using their massive mouths to swallow prey whole.

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Habitat Large rivers, sluggish reservoirs, and deep pools with abundant woody cover or rocky crevices.

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Where Does the Flathead Catfish Live?

Native to the freshwater systems of North America, the flathead catfish is primarily found throughout the Mississippi, Missouri, and Ohio River basins. Its range extends from the lower Great Lakes south into the Gulf states and down into the river systems of northern Mexico. While it is a staple of the central United States, it has been widely introduced to Atlantic slope rivers where it is often managed as an invasive apex predator.

Basemap © OpenStreetMap contributors

3 Countries

4.2M km² Range

Least Concern Conservation

US United States MX Mexico CA Canada

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iNaturalist / Verified observation data

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Behavior

Flathead catfish are the solitary 'lone wolves' of the river bottom. Unlike many other catfish species that may school together, flatheads are highly territorial and aggressive predators. They spend their daylight hours tucked away in 'holts'—dark, sheltered spots such as submerged hollow logs, undercut banks, or dense piles of woody debris. They are remarkably sedentary during the day, often staying in the exact same spot for hours, perfectly camouflaged against the murky substrate.

As nocturnal specialists, flatheads become active hunters under the cover of darkness. They are ambush predators that rely on their sensitive whiskers and lateral lines to detect the vibrations of nearby prey. While they appear sluggish, they are capable of explosive bursts of speed when striking. Interactions with humans are generally limited to angling, though they are known to be quite curious about underwater equipment and will vigorously defend their nesting sites during the spawning season.

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Camera Tips

To successfully capture a flathead catfish on camera, you must think like a bottom-dweller. Because they are strictly aquatic, you will need a waterproof trail camera or a submerged action cam setup. Look for 'snags'—fallen trees or large root balls in slow-moving water. Flatheads love these structures for cover. Position your camera near the entrance of a potential 'hole' or log jam, keeping the lens about 6-12 inches off the riverbed to get a clear profile view of the fish as it emerges to hunt at night.

Lighting is the biggest challenge when filming underwater. Flathead catfish are light-sensitive, so it is crucial to use 'no-glow' infrared (940nm) flash. Traditional white light or visible red glow LEDs will likely spook the fish or cause them to stay tucked deep inside their cover. If the water is murky, try to position the camera closer to the target area (2-3 feet) to reduce 'backscatter'—the reflection of light off suspended particles in the water which can blur the image.

While flatheads aren't scavengers, you can attract them to your camera's field of view by creating a 'chum' zone of movement. A small mesh bag filled with live baitfish (where local regulations allow) secured just outside the camera's frame can create the vibrations and scent trails necessary to draw an apex predator out of hiding. Late spring is an ideal time for placement, as the fish move into shallower rocky areas to spawn and become more visible and active during the day.

Similar Species

Species that look similar or are commonly confused with Flathead Catfish.

Blue Catfish

Blue catfish have a deeply forked tail and a much more silvery-blue, non-mottled skin tone compared to the flathead.

Channel Catfish

Smaller with a deeply forked tail; young channel cats often have dark spots on their sides which flatheads lack.

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Frequently Asked Questions

Flathead catfish are primarily nocturnal. They are most active from dusk until dawn, when they leave their daytime hiding spots in log jams and deep holes to hunt for live prey in shallower flats or along riverbanks.

Since they live underwater, you'll need a submerged camera near river structures like fallen trees or rocky ledges. Unlike other catfish, they are attracted to live prey movement rather than 'stink' baits, so placing your camera in a high-activity area for sunfish or minnows is the best strategy.

Flathead catfish are unique among catfish because they almost exclusively eat live prey. Their diet consists mainly of other fish like sunfish, shad, and carp, as well as crayfish and occasionally small water birds or frogs.

Yes, if your suburban area has a large river or a deep reservoir. They are highly adaptable and can be found in urban waterways as long as there is enough depth, cover (like bridge pilings or submerged debris), and a steady supply of prey fish.

The easiest way is the tail and the jaw. Flatheads have a squared-off or slightly notched tail, while channel catfish have a deeply forked tail. Additionally, the flathead's lower jaw sticks out further than its upper jaw, whereas the channel catfish has an overbite.

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