Morphological and hematological studies of Trypanosoma spp. infecting ornamental armored catfish from Guamá River-PA, Brazil

Abstract

A total of 281 specimens of freshwater armored ornamental fish species (Leporacanthicus galaxias, Lasiancistrus saetiger, Cochliodon sp., Hypostomus sp., Pseudacanthicus spinosus, Ancistrus sp. and Rineloricaria cf. lanceolata) were captured at the hydrological basin of Guamá River, Pará, Brazil. The infection by Trypanosoma spp. was inspected. The morphological and morphometric characterization of the parasites and the hematological parameters were determined. Leporacanthicus galaxias and Pseudacanthicus spinosus presented 100% infection prevalence, and the other species showed a variable prevalence of infection. The parasites showed clearly different morphotypes and dimensions, and probably belong to different species. The hematological response to the infection varied with the host. Cochliodon sp. showed no differences between infected and not infected fish. In other species several modifications on some hematological parameters were found, but apparently without causing disease. It is emphasized the possibility of introduction of the parasites in new environments due to the artificial movements of these ornamental fish.

Infections of Hypostomus spp. by Trypanosoma spp. and leeches: a study of hematology and record of these hirudineans as potential vectors of these hemoflagellates

“…The RBC count, hematocrit and MCV of Hypostomus spp. in this study were similar to those reported by Fujimoto et al (2013) for the same host infected by Trypanosoma spp., while the hemoglobin concentration, MCHC and MCH levels were lower. The hemoglobin concentration and RBC number showed an increase with the intensity of Trypanosoma spp.…”

“…It seems that the virulence factor that leads to anemia is a protease. However, Fujimoto et al (2013) reported that the RBC parameters of Hypostomus sp., Ancistrus sp. and Rineloricaria lanceolata were not influenced by infection by Trypanosoma sp., but the RBC and hematocrit level in Lasiancistrus saetiger increased while hemoglobin concentration decreased.…”

“…and leeches in Hypostomus species from Tapajós River system was found. Fujimoto et al (2013) reported low prevalence and high intensity of Trypanosoma spp. and leeches in Hypostomus species from the Guamá River.…”

Resposta hematológica do cascudo ornamental amazônico Peckoltia oligospila ao estresse de transporte

“…3A) e o VCM (Fig. 3B) (Silva et al, 2012;Fujimoto et al, 2013). CHCM: concentração de hemoglobina corpuscular média.…”

“…As amostras de sangue foram usadas para determinação dos níveis de glicose plasmática, utilizando-se medidor automático (Prestige IQ 50), hematócrito, pelo método de microhematócrito (Goldenfarb et al, 1971), concentração da hemoglobina, pelo método da cianometa-hemoglobina e contagem de eritrócitos totais em câmara de Neubauer. De posse dos dados de eritrócitos, hematócrito e hemoglobina, foram calculados os índices hematimétricos de Witronbe: volume corpuscular médio (VCM), hemoglobina corpuscular média (HCM) e concentração de hemoglobina corpuscular média (CHCM).…”