CONDITION FACTOR AND ECOLOGY OF ENDOHELMINTHS IN <i>Metynnis lippincottianus</i> FROM THE CURIAí­Å¡ RIVER, IN EASTERN AMAZON (BRAZIL)

Abstract

Fish are among the vertebrate groups most susceptible to parasitic infections due to environmental characteristics that can favor the development of parasites; also, position of the host in food web has been associated with the parasitism. The aim of this study was to investigate the ecology of parasites endohelminth in Metynnis lippincottianus from the Curiaú River, in eastern Amazon (Brazil), as well as to evaluate the parasite-host interactions. From 110 specimens of M. lippincottianus examined, 76.3% were infected by one or more parasite species, and a total of 146 parasites such as Procamallanus (Spirocamallanus) inopinatus (Nematoda), larvae of Contracaecum sp. (Nematoda) and Neoechinorhynchus pterodoridis (Acanthocephala) were collected in intestine. However, the dominance was of nematode species, and the parasites had uniform or random dispersion. The parasitic infracommunities showed low Shannon-Wiener diversity (0.2 ± 0.3), low evenness (0.2 ± 0.3) and low species richness of parasites (1.1 ± 0.8). The abundance of Contracaecum sp. presented a weak positive correlation with the weight of hosts, and relative condition factor was not affected by the parasitism. This first study about parasites of M. lippincottianus from Curiaú River basin is the first report of N. pterodoridis for this host.

Composition, frequency and seasonal distribution of periphytic microalgae in stretches of the Curiaú River, Amapá, Eastern Amazon

“…The Zygnematophyceae class also represents a group overly sensitive to environmental changes, being a common class in oligotrophic environments and mesotrophic, with acidic water and low electrical conductivity [32]. This explains the expressive richness of this group in the Curiaú River, which presents such limnological characteristics, as well as other Amazonian rivers [34,35].…”

Checklist of nematodes parasitizing fish in the Brazilian Amazon

“…; Ancistrus leucostictus; Hemiancistrus sp. intestine Borges et al, 2018 Raphidascaroides brasiliensis Moravec & Thatcher, 1997 b AM; PA Megalodoras uranoscopus (Eigenmann & Eigenmann, 1888); Platydoras costatus (Linnaeus, 1758); Pterodoras granulosus Valenciennes, 1821 intestine Moravec & Thatcher, 1997a; Pereira et al, 2015 a AM; AP Astronotus ocellatus; Corydoras amapaensis Nijssen, 1972; Corydoras ephippifer Nijssen, 1972; Corydoras melanistius Regan, 1912; Corydoras spilurus Norman, 1926; Hyphessobrycon amapaensis Zarske & Géry, 1998; Hyphessobrycon takasei Géry, 1964 intestine Thatcher, 1981; Ferreira et al, 2019; Pereira et al, 2019 (Continued ) Pinto & Noronha, 1976; Santos et al, 1979; Andrade et al, 2001; Andrade & Malta, 2006; Saraiva et al, 2006a; Silva et al, 2011; Gaines et al, 2012; Gonçalves et al, 2014; Tavares-Dias et al, 2014b; Alcântara Dias et al, 2015a, b;Oliveira et al, 2015Hoshino et al, 2016;Santos & Tavares-Dias, 2016;Moreira et al, 2017;Tavares-Dias, 2017;Ferreira et al, 2019;Fujimoto et al, 2018;Negreiros et al, 2019a;Pereira et al, 2019;Carvalho et al, 2020;Ailán-Choke et al, 2020…”