Catfish Barbs: Which Catfish Sting and What to Do

The barbs that hurt people are the stiff spines at the front of a catfish's dorsal fin (on its back) and its two pectoral fins (behind the head), not the whiskers. The fish can lock these spines upright when threatened. In many species, venom glands sit alongside the spines, and when a spine punctures skin the gland tissue tears and releases venom into the wound (ScienceDaily, reporting Jeremy Wright's 2009 study).

The whiskers, properly called barbels, are harmless. Wikipedia's channel catfish article explains that barbels cannot sting and are covered in taste buds, about 25 per square millimetre; the fish tastes with its whole body.

Most do. Jeremy Wright's 2009 study in BMC Evolutionary Biology concluded that at least 1,250, and possibly more than 1,600, catfish species may be venomous, far more than earlier estimates, and that venom glands evolved at least twice (ScienceDaily). Cases that come up often in the US:

• Hardhead catfish (saltwater): dorsal and pectoral fins each carry a sharp, slime-covered, barbed spine; Wikipedia warns that a tennis shoe or even a leather-soled shoe offers little protection if you step on one
• Gafftopsail catfish (saltwater): similar spines, recognised by the long fleshy extension on the dorsal and pectoral spines (Wikipedia)
• Small freshwater catfish: catfishedge notes that spines are needle-sharp on fish under about 16 to 18 inches and tend to be duller on large fish

To check which catfish you have, see our catfish species and channel catfish pages.

The main symptom is sharp pain and swelling at the puncture (WebMD). Catfish venom affects nerves and breaks down red blood cells; the study summary lists severe pain, reduced blood flow, muscle spasms and breathing difficulty among possible effects (ScienceDaily). For North American species, the same report says the bigger danger is often infection carried in by the spine, which can last for months.

Sources disagree on how serious a typical sting is. Wikipedia's channel catfish article compares a prick to a mosquito sting, and most stings do settle with first aid. But medical journals record rare severe outcomes: a 2021 case report in the journal Hand describes a man stung on the thumb by a freshwater catfish who developed compartment syndrome and a Vibrio damsela infection and eventually lost his hand at the wrist. Treat any sting that gets worse instead of better as urgent.

These steps come from WebMD's first-aid page and catfishedge's handling guide. They are general information, not medical advice:

• Hot water. Soak the area in water as hot as can be tolerated without scalding, which usually eases the pain (WebMD); test the water with an unaffected hand first
• Remove visible spine pieces with tweezers only if they come out easily; leave deep pieces for a doctor (catfishedge)
• Clean it. Scrub and rinse the wound with fresh water; clean with antiseptic
• Do not tape or stitch the wound shut (WebMD)
• Pain relief: WebMD lists acetaminophen or ibuprofen at label doses
• Check the fish. If a spine is broken, part of it may still be in the wound (catfishedge)

If the person has trouble breathing, collapses or has a severe allergic reaction, call 911 or your local emergency number.

Not always, but WebMD advises getting medical treatment as soon as possible after a sting, and you should see a doctor or urgent care promptly if any of these apply:

• The puncture is deep, on a joint or the hand, or very painful after soaking
• A piece of spine may still be inside; doctors can find it with imaging. A 2017 case in the Journal of Hand and Microsurgery located a spine on X-ray between two hand bones and removed it surgically
• Redness, swelling or pain is spreading, or you develop fever
• The sting happened in salt or brackish water; doctors treating catfish wounds check for Vibrio bacteria, and the 2021 Hand case grew Vibrio damsela
• Your tetanus shot is not up to date (WebMD)

WebMD notes that infected stings are usually treated with oral antibiotics, continued for at least five days after the infection clears.

Remove a spine piece with tweezers only if it is visible and comes out easily, then clean the wound; deep pieces should be removed by a doctor (catfishedge; WebMD).

Prevention, from catfishedge:

• Hold a small catfish with your hand behind the spines, thumb and forefinger resting behind the dorsal spine
• Use a lip-grip tool for medium fish, and a net plus lip grip for large ones
• Do not put your hand in a large catfish's mouth; it is very abrasive

On saltwater piers, never step on a hardhead left on the deck; Wikipedia notes shoes give little protection.

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