6 documents found, page 1 of 1
Microscopic and molecular screening of myxosporeans in teleost fishes caught fr...
Casal, Graça; Neves, Maria João; Machado, Margarida; Rocha, SóniaBackground: Globally, the demand for fishery resources has increased significantly to meet the nutritional needs of the population. With the continuous increase in aquaculture and the introduction of new species, knowledge of the life cycle of infectious agents is essential, as it is crucial for public health and industry [1]. Myxosporeans are microscopic multicellular parasites belonging to the phylum Cnidaria...
Parasitological research of myxozoans in 2 species of benthic fish from Northea...
Casal, Graça; Soares, Rúben; Sá, Mónica; Alves, Ângela; Rocha, SóniaBackground: Myxozoa Grassé, 1970 constitutes a diverse and widespread group of endoparasites that mainly use fish as intermediate hosts and are frequently associated with increased mortality [1]. The increase in the commercialization of sole species in Portugal promotes economic growth in fishing industry and there are presently efforts to produce it in aquaculture. However, despite its commercial relevance, th...
DADOS ULTRA-ESTRUTURAIS DE ESPOROS DE MICROSPORÍDIOS (PHYLUM MICROSPORIDIA) DA ...
Matos, Edilson; Matos, Patricia; Casal, Graça; Geise, Elane; Corral, Laura; Azevedo, CarlosNeste trabalho apresentam-se resultados obtidos em microscopia de luz (ML), microscopia eletrônica de transmissão (TEM) e microscopia eletrônica de varredura (SEM), do ciclo de vida de algumas espécies de microsporídios (phylum Microsporidia Balbiani, 1882), parasitas da fauna ictiológica da região amazonica. Dá-se especial realce aos aspectos ultra-estruturais das diferentes fases do ciclo de vida, com especia...
Ultrastructural and molecular characterization of Glugea serranus n. sp., a mic...
Casal, Graça; Rocha, Sónia; Costa, Graça; Al-Quraishy, Saleh; Azevedo, CarlosA new microsporidian infecting the connective tis sue of the coelomic cavity of the blacktail comber Serranus atricauda, in the Madeira Archipelago (Portugal), is described on the basis of morphological, ultrastructural, and molecular features. The microsporidian formed large whitish xenomas adhering to the peritoneal visceral organs of the host. Each xenoma consisted of a single hypertrophic cell, in the cyto ...
INCIDÊNCIA DE PARASITAS DO PHYLUM MYXOZOA (SUB-REINO PROTOZOA) EM PEIXES DA REG...
Matos, Edilson Rodrigues; Corral, Laura; Matos, Patrícia; Casal, Graça; Azevedo, CarlosNeste trabalho realça-se a importância de ictioparasitas da fauna amazônica, destacando algumas espécies do gênero Henneguya Thélohan, 1892 (Phylum Myxozoa). Estes parasitas constituem um heterogêneo grupo que atua nos mais diversos tecidos, causando grandes malefícios e, em alguns casos, a morte dos seus hospedeiros. Estes parasitas têm sido encontrados em diferentes áreas geográficas e descritos em espécies p...
Ultrastructural description of Ceratomyxa tenuispora (Myxozoa), a parasite of t...
Casal, Graça; Costa, Graça; Azevedo, CarlosThe first ultrastructural description of Ceratomyxa tenuispora Kabata, 1960 (Myxozoa, Bivalvulida) from Madeira Island (Portugal), a parasite found in the gall bladder of the commercially important black-scabbard fish, Aphanopus carbo Lowe is presented. This parasite possesses spherical to ellipsoidal disporous trophozoites. Spores have a central crescent-shaped body averaging 11.0 µm in length, 28.5 µm in thic...