Fauna microparasitária de peixes Hoplias malabaricus (Bloch, 1794) capturados nos municípios de Cachoeira do Arari e Salvaterra, Ilha de Marajó / PA.

Abstract

The study reports the morphological aspects of coccidian and myxosporids under light (LM) and electron microscopy. They were found parasitizing gill, gall bladder and liver, fish teleost Hoplias malabaricus (Bloch, 1794), collected in Cachoeira do Arari and Salvaterra municipalities, Marajó Island / PA. The prevalence of infection was 70%, and 100% for mixosporidiose and coccidiosis, respectively. In mixosporidiose by Myxobolus, the cysts containing the spores were located between the gill filaments elongated shape and whitish; spores with pear-shaped body, measuring 11.87 ± 0.74 μm in length and 7.65 ± 0.43 μm in width and they had two polar capsules with 5.04 ± 0.38 μm in length and 2.32 ± 0.15 μm in width, containing a polar filament with about 5-7 turns. In mixosporidiose by Ellipsomyxa, the diasporic plasmodium had irregularly shape and elongate spores. They were located on the wall and light gallbladder, respectively. The Ellipsomyxa spores presented the following morphometric data: Length 6.7 ± 0.22 μm, width of 3.25 ± 0.27μm with two equal polar capule of 1.97 ± 0.30 μm long and 1.87 ± 0.44 μm wide; the number of turns of the filament polar ranged from 5 to 6 turns. The morphological characteristics of the spores suggest that the species belong to the family Myxobolidae and Myxobolus (Genus Ellipsomyxa) in which, they are probably a new species. In coccidiosis, the oocysts were disseminated throughout liver parenchyma, and by observations under ML (parasitophorous vacuoles containing 4 espocistos, each with two sporozoites), strongly suggests to be species belonging to the Calyptosporidae family, genus Calyptospora. These data describe a new host for Myxobolus, Ellipsomyxa and Calyptospora.