Metacercariae of Austrodiplostomum compactum (Lutz, 1928) (Trematoda, Diplostomidae) infecting the eyes of Plagioscion squamosissimus (Heckel, 1840) (Perciformes, Scienidae) from Lake Catalão, Amazonas, Brazil

Abstract

Austrodiplostomum compactum is a digenetic trematode whith metacercariae that occur in the eyes of a wide variety of fish species. In Brazil, A. compactum metacercariae have been reported in many fish species, but there are only a few studies in the Amazon region. Due to the lack of information in the Amazon, the aim of this study was to report the occurrence of A. compactum metacercariae in the eyes of 15 specimens of Plagioscion squamosissimus from the Lake Catalão, in Amazonas, Brazil. Fishes were collected using gill nets placed randomly in the lake, euthanized in a field laboratory, and had their eyes dissected and examined under a stereomicroscope. A total of 801 metacercariae were registered infecting the eyes of the hosts with a parasitic prevalence of 100%. There was a significant positive correlation between the number of metacercariae recorded and the standard body length of fishes. No significant correlation was found between the number of metacercariae and the weight and relative condition factor (Kn) of the hosts. Values of the variance-to-mean ratio and Green's index suggested an aggregate distribution of the parasites in the hosts, with a low degree of aggregation. This is the first report of occurrence of A. compactum parasitizing a fish in the Lake Catalão.

Metacercariae of Austrodiplostomum spp. (Digenea: Diplostomidae) infecting the eyes and brains of fish in Brazilian Amazon

“…The measurements of Austrodiplostomum spp. from this study were similar to those described by ALBUQUERQUE et al (2017) for P. squamosissimus from the western Amazon region. PINTO; MELO (2013) found that the morphometric measurements of A. compactum metacercariae obtained from experimentally infected Cyprinus carpio were similar to those from other fish.…”

“…with A. compactum infection in the eyes (ZICA et al, 2011). However, high levels of A. compactum infections have been reported for P. squamosissimus from Paraná River, in the São Paulo state (SANTOS et al, 2002) and Catalão Lake, in the state of Amazonas (ALBUQUERQUE et al, 2017).…”

“…In Brazil, it has been registered infecting the eyeballs of Geophagus brasiliensis (NOVAES et al, 2006), Geophagus surinamensis (SANTOS et al, 2002), Cichla ocellaris (SANTOS et al, 2002), Cichla sp. (SANTOS et al, 2002), Cichla monoculus (MACHADO et al 2005;VITAL et al 2016), Satanoperca papaterra (MACHADO et al 2005, Hoplias malabaricus (SANTOS et al, 2002;CORRÊA et al, 2014), Hypostomus regani (YAMADA et al, 2008;ZICA et al, 2009), Schizodon borellii, Auchenipterus osteomystax, Serrasalmus maculatus (YAMADA et al, 2008), and Plagioscion squamosissimus (KOHN et al 1995;SANTOS et al, 2002;MACHADO et al, 2005;SANTOS et al, 2002;ALBUQUERQUE et al, 2017), all of which are fish from different ecosystems. Despite the wide distribution and the increasing number of cases of occurrence of these eye fluke infections in Brazilian fish, the possible impacts on wild fish species remain unknown or neglected.…”

Molecular identification of Austrodiplostomum sp., an eye parasite among farmed tambaqui in Amazonia

“…A series of 12 metric dimensions were taken from 13 metacercariae specimens. Morphological characterization followed the methods of Santos et al (2002 ), Kohn et al (1995 ), Novaes et al (2006 ) and Albuquerque et al (2017 ). Samples were deposited in the Helminthological Collection of the Amazon National Research Institute (INPA).…”

Desenvolvimento Da Economia Circular Na Indústria E Demais Organizações Brasileiras

“…Estas infecções podem provocar diminuição do crescimento e da sobrevivência do peixe, além de alterações morfológicas, que os tornam repugnantes, podendo atuar como potenciais vetores de outras infecções, além da possibilidade de transmissão para o homem (potencial zoonótico) e outros animais(KOHN et al, 2013). Estas metacercárias podem alterar o comportamento dos peixes(SEPPÄLÄ et al, 2004) e a formação de catarata é mais intensa depois que os parasitos completam seu desenvolvimento e estão prontos para infectar o hospedeiro final, aumentando a susceptibilidade do hospedeiro à predação(ALBUQUERQUE et al, 2017), sendo este, um método de transmissão altamente eficiente desses parasitos(MOURITSEN & POULIN, 2003). Annakohniella travassosi, parasitando Rhapiodon vulpinus Spix & Agassiz provenientes do rio Capivara, um tributário do Rio Tocantins.Potamotry gonhenlei (Castelnau) no rio Tocantins, no estado do Pará.Um filo bastante representantivo é Nematoda, que inclui um grande grupo de organismos cilíndricos, alongados, afilados em ambas as extremidades e de simetria bilateral.…”