Nematódeos Parasitos de Macrobrachium Amazonicum (Decapoda: Palaemonidae) na Foz do Rio Amazonas, Pará, Brasil

Abstract

The trophic flow of different organisms constitutes an important link in the life cycle of the parasites, especially the organisms that participate as intermediate hosts in these cycles. Although these relationships have long been described, continue to be of great importance today, mainly because they are an important part of the evolutionary history of parasites. In this way the present work aims to present indices parasitological, occurrence, as well as, Descriptive taxonomy of nematodes of the family Cystidicolidae parasite of Macrobrachium amazonicum, used as food in the Amazon. Samples of shrimp from the Amazon (M. amazonicum) during the months of June to November 2018, captured by matapi (fixed trap) in the river Guamá, in the municipality of Belém. The specimens were transported until the Laboratory of Histology and Embryology Animal (UFRA), cephalothorax were removed individualized in petri dish with physiological solution and submitted to search parasite, the nematodes found were fixed, clarified and observed under microscopy. Of the total cameroon analyzed 16% (19/120) were parasitized with third stage larvae (L3) of nematodes of the family Cystidicolidae with morphological characteristics of the genus Pseudoproleptus. Although the literature does not report the parasitism in humans by Pseudoproleptus, the occurrence of this nematode may adversely affect host growth, metabolism and reproduction, which can lead to death or even to parasitic castration, directly damaging the population dynamics, especially of prawns in Amazonian environments.