Abstract
Hypophthalmus marginatus is among the most commercialized fish from the Amazon region, with fish fillets exported to Southeastern Brazil and other countries. In the present study, the H. marginatus analyzed were parasitized by third-stage larvae of Hysterothylacium sp. and Anisakis sp. These nematodes are being reported for the first time in H. marginatus collected from the Tocantins River, representing a new host and geographical records, and expanding knowledge of the hosts of these nematodes in the Neotropical Region. A brief description with original measurements is presented.
Highlights
The Tocantins River is the second largest river in Brazil, located in the Tocantins-Araguaia hydrographic region, and is a hotspot for fish biodiversity, in which several species are endemic to the region (Agência Nacional de Águas [ANA], 2019)
Hypophthalmus marginatus Valenciennes, commonly known as mapará, is a pelagic fish that is commercialized by slaughterhouses from the Amazon region, which export the fish fillets to Southeastern Brazil and some countries in Europe and North America, besides being among the 10 most commercialized fishes in the Amazon region (Cutrim & Batista, 2005; Costa, Oshiro, & Silva, 2010; Souza & Inhamuns, 2011)
Nematodes were cleared with lactophenol an d observed using a Zeiss Axioscope 2 microscope with differential interference contrast (DIC), equipped with a camera
Summary
The Tocantins River is the second largest river in Brazil, located in the Tocantins-Araguaia hydrographic region, and is a hotspot for fish biodiversity, in which several species are endemic to the region (Agência Nacional de Águas [ANA], 2019). Despite this diversity, only a small number of fish species have been examined for helminths (Eiras, Takemoto, Pavanelli, & Adriano, 2011). Despite the economic importance of H. marginatus, it has never been studied for helminths and, according to Velasco et al (2015), the parasite fauna of H. marginatus may include parasite species that have not yet been described in the literature. The aim of this study is to characterize the nematode fauna of H. marginatus from the Tocantins River, State of Maranhão, identifying species with zoonotic potential
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