No previous studies were carried out on aspects of the helminth assemblages of Seriolella porosa. The present study aims to analyze the metazoan parasite of S. porosa and establish the relationship between the parasitic variations and both fish size and sex. A total of 101 specimens of S. porosa from San Matías Gulf, Argentina were examined between September and October 2006. Thirteen species were reported with a total of 3366 parasites. Lecithocladium cristatum was the most prevalent, dominant and abundant species. The average species richness was 3.2 ± 1.20. The evenness showed an inverse correlation with the total number of parasites and did not reveal differences between host sexes. None of the parasite species showed interspecific associations with each other. The average richness of the infracommunity was significantly less than the component community. The helminth community of ...

The genus Contracaecum belongs to the Anisakidae family which includes parasites of considerable economic and medical importance. Larvae of Contracaecum are associated with a wide variety of freshwater and marine fish. Although there are a significant number of reports that indicate the presence of anisakid in fish from different parts of the world, there are few studies in the central region of Argentina, despite the prevalence observed in recent years. In the present study we provide new records and analyze ecological aspects of anisakid from fish of different aquatic systems with different hydrological characteristics from central Argentina.Atotal of 1402 individuals belonging to nine species, six families and four orders of fish were examinated for nematode parasites. The helminths were found in Astyanax eigenmanniorum (Characidae), Oligosarcus jenynsii (Characidae), Odontesthes bona...