| pathogenicity of the gill artery worm philometra obturans (nematoda) in northern pike (esox lucius) in southwest finland. | the pathogenicity of female philometra obturans (prenant, 1886) was investigated. fish samples were taken in may and june 2001 from lake littoistenjärvi, in southwest finland. the intensity of infection varied between 1 and 4 worms, these being found in the afferent artery of the 2 outermost gill arches. the prevalence was 33.9% (n = 59). host condition and tissue reactions were investigated through dissection and analysis of histopathology. the parasites obstructed the gill arteries, and the ar ... | 2004 | 15040689 |