Ocorrência de endoparasitos intestinais em Rhamdia branneri (Haseman, 1911) em dois riachos da Bacia do Rio Iguaçu

Abstract

Low-order streams contain small species of fish, which serve as hostesses for various parasites. The studies focused on the composition of the parasite fauna in fish are generally used to evaluate the relationship between parasite-host. Through the parasitology is possible meet the environment, noting the stress of a population, food chain structure and biodiversity. The parasitism in fish is influenced by several factors, among them the anthropization. The aim of this study is to analyze the occurrence of endoparasitos in the gut of fish of the species Rhamdia branneri present in two Neotropical streams of the Iguaçu River basin, an urbanized and other preserved. Three collections were carried out in the period from July 2014 to March 2015. In order to characterize the environment, during one of the collections, the rapid assessment protocol (PAR). The specimens were collected by Electrofishing, anesthetized and carried in coolers until the zoology laboratory of the Federal Tecnology University of Paraná- Campus Dois Vizinhos, where we proceeded to the identification of intestinal endoparasitos. Twenty-five specimens of Rhamdia branneri were collected, and 11 in the environment preserved and 14 in the urbanized. Of the 25 individuals analyzed 4 were parasited, being 2 of the environment preserved and 2 of bare land. All endoparasitos found belong to class Nematoda, stressing that these are the most frequent in the intestine. Low parasite richness can be due to environmental factors inadequate to their development and biological characteristics of the species of fish.