I was hoping Cappy would have tossed his input in. The card says true. So a little googling and found this: http://www.catfishedge.com/how-to-hold-catfish/
The spines contained in the dorsal and pectoral fin contain a venom that causes edema (swelling) and a hemolytic (causes increased blood flow in the area of the injury) if these spines puncture the skin.
sorry Cappy was off da grid for a while. old folks say if ya get stung by a catfish ya should rub the sting on their belly. so said the belly slime has an anti venom so they dont sting each other.