Carp: Common, Grass, Silver and Bighead Carp and the Fish Mistaken for Them

In American water, carp first means the common carp: a bronze, whiskered fish of 12 to 25 in (30–64 cm), recorded in every state but Alaska. It is most comfortable in water of about 70 to 85 °F (21–29 °C), rooting along the bank, at times so shallow that its back shows. The starter kit, per the American Carp Society and IGFA, is a can of sweet corn, a size 6–10 hook and 8 to 12 lb line. Four carp from Asia, the goldfish and two native suckers share the name, and the mouth tells them apart.

Carp did not sneak into America. The U.S. Fish Commission imported 345 of them from Germany in 1877 and soon shipped more than 6,000 young carp to 273 applicants in 24 states.

Start here

• How to catch carp: where carp feed, the baits that work and the two rigs that catch them.
• Water temperature for fishing: common carp spawn at 63 to 75 °F (17–24 °C).
• Catfish: the other big bank fish, and the one that takes savory carp baits.
• Other freshwater fish: the native buffalo, gar and bowfin.

Which carp is it?

Two marks sort them. The first is the barbels, the fleshy whiskers at the mouth: a common carp has two pairs, the rear pair the obvious one. The second is a saw-toothed spine, a hardened ray, at the front of the back fin.

The field rule:

1. Barbels: a common carp, whatever its scales (or an escaped koi).
2. No barbels, saw-toothed spine: a goldfish.
3. No barbels, no spine, short back fin: an invasive carp. A belly keel means bighead or silver.
4. No barbels, no spine, long sickle-shaped fin: a native buffalo or carpsucker.

Missouri’s field guide notes that river carpsuckers get called white or silver carp in error.

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How did carp get to America?

“In 1877, the U.S. Fish Commission imported Common Carp from Germany,” as the U.S. Geological Survey puts it. Its 345 common, mirror and leather carp were bred in ponds in Baltimore, then near Washington, and by 1880 the commission was getting 2,000 letters a year. Carp were often released from railroad tank cars at bridge crossings into streams. Most states stopped stocking them in the mid-1890s.

Why is carp a trash fish here and a prize in Europe?

The reputation fell with the price. Carp from shallow, stagnant ponds tasted of mud, and by the 1890s they sold for “3 cents or 4 cents a pound”. The wealthy switched to fish the poor could not get, and the carp became, in the American Carp Society’s history, “the perfect scapegoat” for losses that changes in land use did more to cause.

The damage is real too: a feeding carp stirs up the bottom, which USGS links to cloudier water and University of Minnesota researchers to algal blooms. In much of Europe carp remain a delicacy, and the IGFA calls it “one of the hardest fighting freshwater game fish in the world”.

A European prize: the author, Jeroen Leidelmeijer, with his personal-best 40 lb (18.3 kg) mirror carp. Photo: Jeroen Leidelmeijer.

Are carp good to eat?

Yes, with two cautions. In January 2025, Seafood Watch rated common carp netted in Illinois a Best Choice. The first caution is bones: New York’s DEC describes two rows of floating bones along each side and says to score or grind the fillets. The second is the water: long-lived and fatty, carp gather contaminants, especially in urban and suburban water, so check your state’s advisory as you would for bass you plan to keep. Illinois markets silver, bighead and grass carp as copi.

How big and how old do carp get?

Illinois puts the top end at “48 inches and more than 80 pounds”. Growth depends on the lake: computed from FishBase growth data, a 20-in (51 cm) carp is about 3 years old in Illinois’s Hennepin and Hopper lakes but about 10 in Nebraska’s Marsh Lake. To age a carp, biologists count the yearly rings on its otoliths, small inner-ear stones that, unlike scales, do not reabsorb in lean times. USGS puts the wild lifespan at about 20 years.

The IGFA all-tackle world records for carp and their look-alikes:

Oklahoma’s state record bighead, 118 lb 10 oz on rod and line in 2025, outweighs the IGFA fish. Common carp state records run lighter:

Will carp clean up a pond?

Grass carp will eat the weeds, though Missouri warns that they commonly remove too much, and USGS notes that what they pass undigested enriches the water and promotes algal blooms. Common carp make a pond muddier. In Texas only triploid grass carp, made sterile in the hatchery, are legal, by permit, and Texas A&M AgriLife recommends 7 to 15 per acre. Check your state first: Minnesota prohibits them and wants any grass carp reported to the DNR immediately.

What are the invasive carp, and can you keep one?

The U.S. Fish and Wildlife Service calls grass, bighead, silver and black carp invasive carp; it dropped the name Asian carp in April 2021. Bighead, silver, black and largescale silver carp are federal injurious wildlife under the Lacey Act (50 CFR 16.13): no import, transport or acquisition without a permit. Missouri bans silver and bighead carp as live bait and says: “Do not collect, transfer, or dump this fish!”

How do you catch carp in a lake?

Look in late evening and early morning, when carp root along the bank and roll at the surface. Keep the line slack: carp “tend to drop a bait at the slightest resistance”, says New York’s DEC; how to catch carp has the rigs. No agency or carp-society guide mentions hot dogs; the baits they do name are sweet corn, bread, dough balls and worms.

The names, if you want them

Carp names many larger fish of the family Cyprinidae; the verb “to carp” has a separate root. The common carp, also called German or European carp, is Cyprinus carpio; koi were bred, by most accounts, from the Amur carp, Cyprinus rubrofuscus. Goldfish and crucian carp are Carassius. Every other fish is in the species guide.

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