Number of nematodes in the swim bladder showed an increasing trend in infection across the 3 sampling years and a significant increase in the silver eels collected in 2019 ( Fig. 3 ).
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Towards an <i>in situ</i> non-lethal rapid test to accurately detect the presence of the nematode parasite, <i>Anguillicoloides crassus</i>, in European eel, <i>Anguilla anguilla</i>.
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