New host record and geographical distribution of Nematoda parasitizing Hypophthalmus marginatus Valenciennes (Siluriformes) from the Tocantins River, Brazil

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.

Two new species of Curvianchoratus (Monogenoidea, Dactylogyridae) parasitizing Psectrogaster amazonica (Characiformes, Curimatidae) and a new record for Curvianchoratus singularis in the Tocantins River, Maranhão, Brazil

“…Studies on the parasite diversity of freshwater fish from the Tocantins-Araguaia Basin have gradually increased in recent years [see Fehlauer and Boeger (2005) ; Boeger et al (2006) ; Kritsky et al (2007) ; Domingues and Marques (2011) ; Kritsky et al (2013) ; Aguiar et al (2017) ; Cárdenas et al (2019 , 2021 , 2022 ); Cohen et al (2020) ; Freitas et al (2021) ].…”