Resumo Este estudo foi realizado no norte do Brasil, para determinar a prevalência de helminto parasitas que infectam Phalacrocorax brasilianus (Gmelin, 1789). Entre julho de 2020 a julho de 2023, parasitos adultos e larvas foram coletados do trato respiratório e gastrointestinal de 30 espécimes dessas aves que morreram em redes de pesca e no curral de pesca, no município de Soure na Ilha de Marajó. Os parasitas identificados incluem os nematódeos Contracaecum sp., Contracaecum australe, Contracaecum rudolphii sensu lato, Contracaecum microcephalum, Contracaecum multipapillatum, Syncuaria squamata, Desportesius invaginatus, Tetrameres sp., Aplectana sp., Cyathostoma sp., Eucoleus contortus, Baruscapillaria spiculata, Baruscapillaria appendiculata; os trematódeos Drepanocephalus spathans, Austrodiplostomum mordax, Austrodiplostomum compactum, Hysteromorpha triloba; os cestódeos Paradilepis caballeroi; e os acantocéfalos Andracantha sp., Southwellina hispida e Southwellina macracanthus. O nível geral de infecção foi de 96,66% (29/30) e os helmintos mais presentes foram os nematódeos (96,66%; 29/30), seguidos dos Acantocéfalos (66,66%; 20/30). Esses dados aumentam o conhecimento sobre helmintos em cormorões amplamente distribuídos pela ilha de Marajó. Brasil Gmelin, Gmelin (Gmelin 1789. 1789 . 1789) 202 2023 3 Marajó sp sp. australe lato microcephalum multipapillatum squamata invaginatus contortus spiculata appendiculata spathans mordax compactum triloba caballeroi macracanthus 9666 96 66 96,66 29/30 2930 29 (29/30 (96,66% 29/30, , 29/30) 66,66% 6666 (66,66% 20/30. 2030 20/30 20 20/30) 178 966 9 6 96,6 29/3 293 2 (29/3 (96,66 66,66 666 (66,66 203 20/3 17 96, 29/ (29/ (96,6 66,6 (66,6 20/ 1 (29 (96, 66, (66, (2 (96 (66 ( (9 (6
Abstract This study was carried out in northern Brazil to determine the prevalence of helminth parasites that infect Phalacrocorax brasilianus (Gmelin, 1789). Between July 2020 and July 2023, adult and larvae parasites were collected from the respiratory and gastrointestinal tract of 30 birds that died in fishing nets and in fishing corral in the municipality of Soure on Marajó Island. The identified parasites included the nematodes Contracaecum sp., Contracaecum australe, Contracaecum rudolphii sensu lato, Contracaecum microcephalum, Contracaecum multipapillatum, Syncuaria squamata, Desportesius invaginatus, Tetrameres sp., Aplectana sp., Cyathostoma sp., Eucoleus contortus, Baruscapillaria spiculata, Baruscapillaria appendiculata; the trematodes Drepanocephalus spathans, Austrodiplostomum mordax, Austrodiplostomum compactum, Hysteromorpha triloba; the cestodes Paradilepis caballeroi; and the acanthocephalans Andracantha sp., Southwellina hispida and Southwellina macracanthus. The whole prevalence was 96.66% (29/30) and the most frequent helminths were nematodes (96.66%; 29/30), followed by acanthocephalans (66.66%; 20/30). These data increase the knowledge about helminths in cormorants widely distributed to Marajó Island. Gmelin, Gmelin (Gmelin 1789. 1789 . 1789) 202 2023 3 Island sp sp. australe lato microcephalum multipapillatum squamata invaginatus contortus spiculata appendiculata spathans mordax compactum triloba caballeroi macracanthus 9666 96 66 96.66 29/30 2930 29 (29/30 (96.66% 29/30, , 29/30) 66.66% 6666 (66.66% 20/30. 2030 20/30 20 20/30) 178 966 9 6 96.6 29/3 293 2 (29/3 (96.66 66.66 666 (66.66 203 20/3 17 96. 29/ (29/ (96.6 66.6 (66.6 20/ 1 (29 (96. 66. (66. (2 (96 (66 ( (9 (6