| [helminth parasites of pirarucu, arapaima gigas (schinz, 1822) (osteoglossiformes: arapaimidae) from araguaia river, state of mato grosso, brazil]. | sixty-five specimens of pirarucu collected in august 2004 from araguaia river, state of mato grosso, brazil, were examined to study their helminth parasites. five species were recorded parasitic arapaima gigas: dawestrema cycloancistrium (monogenea) in gills, nilonema senticosum and goezia spinulosa (nematoda) in the swimbladder and stomach, respectively; caballerotrema brasiliense (digenea) and polyacanthorhynchus rhopalorhynchus (acanthocephala) in the intestine. highest prevalence values were ... | 2008 | 19245767 |