| epidemiology of anguillicola crassus in the european eel (anguilla anguilla) from two rivers in southern england. | european eels anguilla anguilla from the rivers thames and test, in the south of england, were examined between 2000 and 2003 for infection with the swim-bladder nematode anguillicola crassus. since its introduction to thames eels at tidal estuarine locations circa 1987, a. crassus has become established in non-tidal freshwater stretches upriver and data from these locations are reported for the first time. the prevalence of infection at thames estuary locations was higher during 2000-2003 than ... | 2005 | 15977905 |