could be a swamp eel.
Think 3ft and jaws powerful enough to cause your hand serious damage.
"Swamp Eels
Swamp eels have recently started to become more common in the more specialised shops where they are sold as "tulip eels", small specimins may catch the eye of the oddball enthusiast but these small interesting eels quickly grow into large predatory monsters and only the dedicated fish keeper with a large tank free to use as a species tank is able to house them. There are 3 species imported which are listed below.
Synbranchus marmoratus, Marbled swamp eel; The most commonly imported of the swamp eels this species will quickly grow to around 3 feet in captivity and is a formidable predator, adults should only be kept in a species tank. The jaws are powerful enough to do considerable damage to the unwary owners hands!
Monopterus albus, Asian swamp eel; While not reaching the same size as its American cousin S.mamoratus the Asian swamp eel is still a large and very predatory fish, captive adults top out at around 2 feet and should be kept in a species tank.
Ophisternon infernale, Blind swamp eel; Not as comonly imported and almost identical in appearance and size to M.albus, as with other swamp eels a species tank is recommended."
from CFC.