2018-03-222018-03-222014-06MELO, Francisco Tiago de Vasconcelos et al. Histopathologic aspects in Plagioscion squamosissimus (HECKEL, 1940) induced by Neoechinorhynchus veropesoi, metacestodes and anisakidae juveniles. Revista Brasileira de Parasitologia Veterinária, Jaboticabal, v. 23, n. 2, p. 224-230, jun. 2014. Disponível em: <http://repositorio.ufpa.br/jspui/handle/2011/9615>. Acesso em:.1984-2961https://repositorio.ufpa.br/handle/2011/9615Plagioscion squamosissimus (Heckel 1840), a fish endemic to the Amazon Basin and commonly known as the “silver croaker”, plays an important role in the ecology and economy of Pará State, Brazil. Knowledge of host-parasite relationships is important to understanding the role of parasites in the control of natural host populations. This work describes histopathological aspects caused by several common intestinal parasites found during a helminthological survey of fish in northern Brazil. We observed a high prevalence of helminth infection, especially by J3 nematode juveniles of the family Anisakidae and metacestodes of the family Protocephalidae (both with 100% prevalence). An external capsule surrounded each juvenile with numerous juveniles inside sac-like structures formed of connective tissue. Inflammation was observed to be caused by infection of metacestodes, reaching the intestinal muscularis mucosa. Neoechinorhynchus veropesoi (38% prevalence) was found in the small intestine of P. squamosissimus, invading the mucosa, submucosa, and internal muscularis of the intestine causing intense inflammation. Histopathology of host-parasite relationships in fish has been rare, and the pathology of parasites in P. squamosissimus is described herein.Acesso AbertoHistopatologiaRelação hospedeiro-parasitoPlagioscion squamosissimusNeoechinorhynchus veropesoiMetacestódeosAnisakidaeArtigo de PeriódicoCNPQ::CIENCIAS BIOLOGICAS::PARASITOLOGIAhttp://dx.doi.org/10.1590/S1984-29612014048