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Blue Catfish

Blue Catfish

The largest catfish native to North America, blue catfish are big-river fish at heart — built for the deep channels and tailwaters of the Mississippi, Missouri, Ohio, and Rio Grande systems, with established introduced populations across the Chesapeake watershed and a handful of western reservoirs.

Mature fish in the 30–70 pound class are common where populations are healthy, and 100-pounders are a real possibility.

Scientific Name: Ictalurus furcatus

Also known as Blue cat, Humpback blue, Great blue catfish

Physical Characteristics:
  • Heavy-bodied with a pronounced dorsal hump, slate blue-gray on the back fading to a chalky white belly. Breeding males darken to a deep blue.
  • The straight, comb-edged anal fin with 30–36 rays is the cleanest field mark — channel cats have a rounded anal fin with 24–29 rays and dark body spots that blue cats lack.
  • Deeply forked tail with rounded lobes, four pairs of barbels, stout serrated pectoral spines, and an upper jaw that protrudes slightly past the lower.
  • Typical adults run 25–46 inches and 30–70 lbs; the IGFA all-tackle record is 143 lbs from Kerr Lake on the Virginia–North Carolina line.

What to know

Habitat Distribution

  • Native to the Mississippi, Missouri, Ohio, Tennessee, and Arkansas basins, the Rio Grande drainage, and Gulf Coast rivers from Mobile Bay west into Texas.
  • Stocked into nearly 20 states outside the native range — most consequentially the Atlantic-slope rivers of the Chesapeake watershed (introduced in the 1970s) and the Carolinas, where they're now classified as invasive.
  • A big-river and big-reservoir fish: open main channels, deep backwaters, and tailwaters with current, usually over sand, gravel, or rock. Tolerates turbidity and salinity up to 15 ppt, which lets Chesapeake-system fish move between tidal rivers through brackish bay water.
  • Highly mobile — one tagged fish moved more than 400 miles in a year, shifting upstream toward cooler water in summer and dropping back to deeper, warmer pools in winter.

Specific Spots

  • Tailwaters below dams are the classic big-fish water — current concentrates stunned and injured baitfish in predictable lanes over hard bottom.
  • Deep main-channel edges, ledges, and the lips of holes where current breaks against gravel, riprap, or boulder substrate.
  • In reservoirs, schools will sit beneath open-water bait pods — including under feeding stripers — picking off cripples that sink out of the action.
  • During the spawn, fish tuck into low-current pockets behind boulders, root wads, undercut banks, and depressions, where males stay on the nest guarding eggs and fry.

Blue Catfish FAQ

Answers from onWater's species guide.

What are the best lures and bait for Blue Catfish?

Fresh cut bait does the heavy lifting almost everywhere, gizzard shad first, then menhaden, herring, white perch, eel, and bluegill. Anglers chasing 60-lb-plus fish often switch to live bait of the same species.

What do Blue Catfish eat?

Smaller fish make up roughly half the diet, with cut shad, herring, and menhaden the dominant baits range-wide, gizzard shad in particular is the bait most experienced anglers reach for first.

Where do Blue Catfish live?

Native to the Mississippi, Missouri, Ohio, Tennessee, and Arkansas basins, the Rio Grande drainage, and Gulf Coast rivers from Mobile Bay west into Texas.

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