Abstract
Priacanthus arenatus is a fish that occurs in the waters of the western Atlantic Ocean and has few records of parasitism. This study aimed to report histological changes caused by the larvae of Hysterothylacium deardorffoverstreetorum. Between July and December, 2013, 30 samples of P. arenatus were obtained from fish markets in the cities of Niterói and Rio de Janeiro, state of Rio de Janeiro, Brazil. Fragments of spleen, liver, stomach wall and mesentery tissues containing nodules and free parasites were extracted to histopathological study. Through histological analysis it was verified that these nodules consisted of connective tissue capsules, in which the parasites were located, with granulomatous inflammation mainly comprised of macrophages and lymphocytes. These nodules also consisted of a central portion of acellular amorphous material, formed by concentric layers, which was slightly basophilic and contained tunnels and, sometimes, parasite debris. The presence of tunnels in acellular amorphous material suggests that the larvae are initially located at the center of the nodules and then they migrate to the surface.
Highlights
Priacanthus arenatus is a fish that occurs in the waters of the western Atlantic Ocean and has few records of parasitism
This study aimed to report histological changes caused by the larvae of Hysterothylacium deardorffoverstreetorum
Between July and December, 2013, 30 samples of P. arenatus were obtained from fish markets in the cities of Niterói and Rio de Janeiro, state of Rio de Janeiro, Brazil
Summary
Priacanthus arenatus Cuvier, 1829, the Atlantic bigeye, is a fish of appreciated flavor and high commercial value that occurs in the waters of the western Atlantic Ocean. This fish has nocturnal habits, lives between the coastline and a water depth of around 130 meters and feeds on small fish, crustaceans, and polychaetes (FIGUEIREDO & MENEZES, 1980). Among the parasites that present risks to human health and can be found in this fish species, nematodes of the families Anisakidae and Raphidascarididae can be highlighted These nematodes use teleost fish, cephalopod molluscs and small crustaceans as intermediate hosts (ADAMS et al, 1997). There are few records of parasitism by helminths in P. arenatus. Pinto et al (1988) reported the presence of Oncophora melanocephala Baudin-Laurencin, 1971; Fábio (2000) recorded the presence of O. melanocephala, Stephanostomum seriolae Yamaguti, 1970, Pseudopecoelus priacanthi (MacCallum, 1921), Brachyphallus parvus (Manter, 1947) and Diplectanotrema balistes Price, 1937. Tavares et al (2001) investigated the ecology of the metazoan parasite community of this fish and registered the presence of Lecithochirium sp., Opecoeloides sp., Diplectanotrema sp., Scolex pleuronectis, Polymorphus sp., O. melanocephala, Raphidascaris sp., Pseudoterranova sp. and Contracaecum sp
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