Populations of European Eel Anguilla anguilla were sampled in two adjacent lakes, Doon Lough Upper and Doon Lough Lower, using earthworm-baited longlines that were deployed using a novel grid-sampling protocol. Minimum estimates of eel density and biomass were obtained. Analysis of these catch statistics and eel size frequencies indicated that the two lakes differed, with the lower lake having higher density but smaller eels than the upper lake, though biomass was similar in the two systems. The invasive, swim-bladder infecting, Asian nematode parasite Anguillicoloides crassus was present in both eel populations and the infection parameters recorded were similar.
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