Blue Catfish: Identification, Size, Season and the Chesapeake Invasion

The blue catfish is the largest catfish in North America and the one anglers travel for. The 143 lb world record came from a Virginia reservoir in 2011, and at least twelve states have a certified state-record blue over 100 lb; the world record catfish page lists them. It is a river fish by nature, a fish of current, sand and gravel, that grows faster than the channel catfish and lives to 25. East of the Appalachians it is also one of the most consequential invasive species in American water.

The world record blue catfish weighed 143 lb and came from Kerr Lake, Virginia, in 2011. At least twelve states have a certified state record over 100 lb, from the Mississippi and Missouri rivers to Georgia and the Carolinas.

How do you tell a blue catfish from a channel?

Big channel catfish lose their spots and small blue catfish are not blue, so the color rule fails at both ends. The anal fin settles it. A blue catfish has 30–35 rays on a fin whose outer edge is straight, so the fin looks squared; a channel catfish has 24–29 rays on a rounded fin. Texas’s channel catfish page puts it as simply as it can be put: the blue “always has 30 or more”. Count the rays; do not go by color.

The other marks back that one up. The back slopes steeply and straight from the dorsal fin to the head, which gives the fish a wedge-shaped profile. The color is pale bluish-silver above and silvery white below, with no dark spots at any age; the one exception is in Texas, where “only the Rio Grande population has dark spots on the back and sides”. The tail is deeply forked, as on a channel catfish; the flathead, the other giant, has a square tail that rules it out at a glance.

Where do blue catfish live?

The native range is the Mississippi, Missouri, Ohio and Rio Grande basins, from Pennsylvania to South Dakota and south to the Gulf; Texas Parks and Wildlife carries it on through Texas and Mexico into northern Guatemala. Missouri’s field guide describes the water they choose: “swift chutes, pools with noticeable current, and silt-free substrates of sand, gravel, and rubble”. Where they can find them, they prefer depths beyond about 20 ft (6 m).

Big rivers and the reservoirs on them are the classic water. The fish also tolerates brackish water to about 15 parts per thousand, which is the reason it thrives in tidal estuaries.

Blue catfish turn to fish early. Texas Parks and Wildlife notes blues as small as 4 in (10 cm) eating fish, and fish over 8 in (20 cm) eat fish and large invertebrates. Virginia’s agency lists small fish, crayfish, mollusks and plant matter, and the biggest blues eat mostly other fish.

Free PDF · Catfish cheat sheet When do catfish bite, and what do they want on the hook?

One reading, and the 16-page cheat sheet tells you which catfish is feeding, where it sits and what to put on the hook; with the five rigs drawn and a trip step by step.

Your email address

Send me the free sheet

Enter your email, confirm it with one click, and the PDF is in your inbox. Plus one email a week on what's biting. Unsubscribe anytime. Privacy.

Why are blue catfish taking over the Chesapeake?

That salt tolerance is the Chesapeake story. Virginia stocked blue catfish in the James and Rappahannock rivers in 1974, and in the York in 1985, for sport; nearly twenty states have stocked them. By 2023 they were in every Virginia tributary of the Chesapeake Bay and spreading through Maryland’s.

Blue catfish now make up as much as three quarters of the biomass in the James, Rappahannock and York. A James River study estimated 1.6 million fish in a 12 km (7.5 mile) stretch. The fish eat 8–9% of their body weight a day, including menhaden, river herring and blue crab.

The response is harvest. Watermen in Maryland and Virginia landed more than 5 million lb (2.3 million kg) in 2017. Virginia’s wildlife agency “encourages the harvest of small Blue Catfish, following consumption advisories”, and its rules set no daily limit on the tidal James above Hog Point. Maryland’s natural resources department sets “no offseason and no creel limit” and says blue catfish “should not be caught and released”. For an angler in those waters the rule is the reverse of most places: keep the small ones.

Are blue catfish good to eat?

Yes. University of Maryland Extension calls the flesh mild and flaky, with a taste similar to striped bass. Adults are not bottom feeders, it adds, so the meat does not pick up a muddy taste. The commonly caught fish of 15 to 36 in (38–91 cm) have fillets it calls safe to eat; older, bigger fish carry more PCBs and mercury.

Virginia’s health department draws the line on the tidal James: blue catfish of 32 in (81 cm) or more, do not eat; smaller ones, no more than two meals a month. Pregnant women, nursing mothers and young children should eat no fish on an advisory list. Check the Virginia advisories or your own state’s before keeping fish, and cook them through.

When do blue catfish bite?

The biggest fish bite in the cold. On Jim Moyer’s calendar the heavyweights start in November and run through January. Texas guide Chad Ferguson told Texas Parks & Wildlife magazine that his trophy season starts once the water drops into the 60s and the shad school up. He sees the most big fish “in late fall and early winter”. The calendar below is Moyer’s, a Cumberland River guide in Tennessee, as told to Don Wirth for In-Fisherman, and is quoted as his.

How do you catch blue catfish?

The bait rule for blue catfish is fresh cut fish. Shad and skipjack herring come first, with cut carp, drum, buffalo and bluegill behind. Chad Ferguson’s rule at Catfish Edge is “the oilier the fish the better”, and fresh bait outfishes frozen “almost every day of the week and twice on Sunday”. Fished side by side, he found, blues take fresh dead bait as well as live. Moyer is the exception: he fishes live shad from April into July and calls June “the best month to fish with livebait”. The best catfish bait page has more on each one.

The rig is a slip-sinker rig or its drifting cousin, the Santee Cooper rig, with a peg float on the leader to lift the bait off the bottom. The catfish rigs page has both. In tidal rivers Virginia’s agency suggests ¾–1½ oz (21–43 g) of lead; in the big reservoirs and rivers of the Moyer calendar it takes 3–8 oz (85–227 g).

The rigs page sizes the tackle from its sources: 5/0–8/0 circle hooks on chunks and 8/0–10/0 on heads and trophy fish. The rod is a 7 to 8½ ft medium-heavy one with a strong butt; the line is 20–30 lb mono or 50–65 lb braid. The catfish rigs page has the rig table, the hooks hub the sizes and the catfish hub the other species. Anchor on the structure the calendar names, from outside channel bends to mud-bottom ledges, give a spot 60 to 90 minutes, as Moyer does in December, and move.

How big do blue catfish get?

Blue catfish grow fast for a catfish and live long. They mature at about 5 lb (2.3 kg), four to seven years old. On the James River, Animal Diversity Web reports fish of up to 3 lb (1.4 kg) at eight years and up to 20 lb (9 kg) at eleven. They live nine to ten years on average and up to 25, the oldest age a 2018 study of four Virginia tidal rivers observed. A fish over 100 lb is an old one. Texas Parks and Wildlife biologist Bruce Hysmith put the 121.5 lb Texas record at 27 to 30 years old, and Missouri’s biologists estimated Greg Bernal’s 130 lb Missouri River fish of 2010 at 20 to 30 years.

A well-fed 30 in (76 cm) blue weighs about 12 lb (5.4 kg) on the standard-weight equation of Muoneke and Pope. The curve describes a fish in above-average condition, so an average fish runs a little lighter; the table has 20, 40 and 50 in.

The record fish was caught by Richard Nicholas Anderson, drifting a piece of chicken on a Shakespeare Ugly Stik rod and a Daiwa reel. It beat Greg Bernal’s 130 lb Missouri River blue of July 2010. Bernal’s fish had beaten the 124 lb Mississippi River fish caught near Alton in May 2005, which in turn had taken the world record from Cody Mullennix’s 121.5 lb (55.1 kg) Lake Texoma blue of January 2004. Anderson tried to keep it alive in a 250-gallon tank, where it died the next day; the world record catfish page tells the story. Missouri’s guide notes 19th-century reports of blue catfish “over 300 pounds”. Treat those as reports, not records.

Regulations vary by state, and where blues are managed for size the rules protect the oldest fish. Texas allows 25 blue and channel catfish a day combined, of which only 10 may be 20 in (51 cm) or longer, and special rules apply on some waters. Virginia asks anglers to keep the small ones but allows only one blue over 32 in (81 cm) a day on Kerr Reservoir, Lake Gaston and the tidal James above Hog Point. Maryland sets no limit at all. The state pages carry the current rules.

How do blue catfish spawn?

Blue catfish spawn in late spring and early summer. Virginia’s agency puts it at 70–75 °F (21–24 °C); NOAA dates it late May into June in the Chesapeake. A female produces 2,000 to 4,000 eggs per pound of body weight, so a 10 lb (4.5 kg) fish lays more than 20,000. The eggs go into a cavity nest 6–14 in (15–36 cm) across, guarded by the male, and hatch in six to ten days.

Free PDF · 16 pages

Know what the catfish want tonight before you leave the house

The Catfish Cheat Sheet. A 16-page PDF. Take one water temperature reading, find your season on the sheet, and it tells you which catfish is feeding, where it sits and what goes on the hook. The sheet is two pages; the fourteen behind it are the depth.

• The temperature that shuts channel cats down while blue cats keep biting all winter
• Five rigs drawn, three tied step by step, and the one mistake that loses more catfish than any other
• The bait and hook for each catfish, from punch bait on a #4 treble to a live bluegill on a 7/0 circle, and which states let you use that bluegill
• A catfish trip in nine steps, with the night checklist and what a bite feels like on a tight line

Your email address

Send me the free sheet

Every line from the catfish pages on fishing.info and the 151 sources behind them, Missouri and Texas wildlife agencies among them.

Enter your email, confirm it with one click, and the PDF is in your inbox. Plus one email a week on what's biting. Unsubscribe anytime. Privacy.