Infection of the muscle tissue of the filter-feeding cichlid, Chaetobranchopsis orbicularis Steindachner, 1875, by Kudoa orbicularis (Myxozoa: Multivalvulidae) on Marajó Island in the Brazilian Amazon region

Abstract

Infection of the muscle tissue of the filter-feeding cichlid, Chaetobranchopsis orbicularis

New occurrence of Kudoa orbicularis parasitizing the freshwater catfish Trachelyopterus galeatus (Siluriformes: Auchenipteridae) in the Brazlian Amazon region

“…In both cases, no evidence of inflammation or any other response to the presence of the parasite was observed in the host. However, Azevedo et al (2016) and Sindeaux-Neto et al (2017) did observe inflammation in the muscle tissue infected by K. orbicularis, as well as lethargic behavior in the host fish, including irregular tail movements and immobility, although these patterns were not observed in T. galeatus in the present study. The similarities in the morphological characteristics of the K. orbicularis specimens observed in the present study, in comparison with the original description of this species (AZEVEDO et al, 2016), together with the muscle tissue tropism, the freshwater habit of the host and the geographical location of the two cases, all confirm the species identification.…”

“…This is same locality from which the T. galeatus specimens analyzed in the present study were collected. The morphological features of the K. orbicularis spores and polar capsules found in T. galeatus were closely similar to those described by Azevedo et al (2016) and Sindeaux-Neto et al (2017) in the K. orbicularis specimens obtained from the host fish C. orbicularis. Despite being the same species, minor morphological differences in the size of myxozoan spores are typically found in different hosts (KOVALEVA et al, 1979;YANAGIDA et al, 2004).…”