LAUSR

ABSTRACT The parasite communities of marine fish in the tropical Pacific remain poorly studied. We did an initial study of the metazoan parasite communities of striped bonito Sarda orientalis from the Pacific coast of Mexico. Two hundred thirty individuals from two locations were collected between April 2017 and March 2018. Twenty-two metazoan parasite taxa (20 helminths and two Crustacea) were identified: one species of Monogenea, twelve of Digenea, one of Acanthocephala, two of Cestoda, four of Nematoda, one of Copepoda, and one of Isopoda. Didymozoid digeneans (six species) were the most frequent and abundant parasite species at both sampling locations. Parasite species richness at the component community level was similar in both locations (16–17 species). However, parasite community structure and species composition varied between them. Local fluctuations in some biotic (e.g. host feeding behaviour and body size) and abiotic environmental factors were probably responsible for these variations.