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HISTOPATHOLOGY AND AUTOECOLOGY OF DIDYMOCYLINDRUS SIMPLEX (DIGENEA: DIDYMOZOIDAE), PARASITE OF KATSUWONUS PELAMIS (SCOMBRIDAE) IN THE SOUTHWESTERN ATLANTIC OCEAN, OFF SOUTH AMERICA
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Helmintos Parasitos de Peixes. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Helmintos Parasitos de Peixes. Rio de Janeiro, RJ, Brasil.
Universidade Estadual de Santa Cruz. Departamento de Ciências Biológicas. Ilhéus, BA, Brasil.
Universidade Estadual de Santa Cruz. Departamento de Ciências Biológicas. Ilhéus, BA, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Helmintos Parasitos de Peixes. Rio de Janeiro, RJ, Brasil.
Universidade Estadual de Santa Cruz. Departamento de Ciências Biológicas. Ilhéus, BA, Brasil.
Universidade Estadual de Santa Cruz. Departamento de Ciências Biológicas. Ilhéus, BA, Brasil.
Abstract
Pathological alterations and autoecology of Didymocylindrus simplex in Katsuwonus pelamis (Linnaeus, 1758)
in the Southwestern Atlantic Ocean off of South America are presented. This is the first record of the species in the
region; the specimens are described. The pathologic changes observed most often were infiltration of lymphocytes and
slight fibrosis of the connective tissue surrounding the parasite. The typical aggregated distribution pattern was observed
for Didymocylindrus simplex Ishii, 1935. Statistical analysis demonstrated no correlation between the abundance
and prevalence of parasites with the total length of the host. The sex of the host does not influence the prevalence and
intensity of infection.
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