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Brazilian catfish parasitized by Epistylis sp. (Ciliophora, Epistylididae), with description of parasite intensity score

de Pádua, Santiago Benites, Ishikawa, Márcia Mayumi, Ventura, Arlene Sobrinho, Jerônimo, Gabriela Tomas, Martins, Maurício Laterça, Tavares, Luiz Eduardo Roland
Parasitology research 2013 v.112 no.1 pp. 443-446
Ciliophora, Pseudoplatystoma corruscans, catfish, condition factor, emerging diseases, farmed fish, females, fish diseases, host-parasite relationships, hybrids, parasites, parasitism
The determination of mean intensity of parasitism for colony-forming sessile protozoan such as Epistylis has been a great problem in parasitological studies. Some alternatives have been proposed by researchers for laboratory and field conditions. This study describes the criteria to establish the parasitic intensity score for epistylidid infestation in fish. Parasite distribution and the host-parasite relationship in four species of Brazilian cultured catfish and their hybrids are discussed. The highest prevalence rates were found in the hybrid jundiara, Leiarius marmoratus male × Pseudoplatystoma reticulatum female (96.4 %), followed by jurupoca, Hemisorubim platyrhynchos (60 %), and the hybrid surubim, Pseudoplatystoma corruscans male × P. reticulatum female (52.7 %). Positive correlation between parasitic intensity score and the fish size, weight, and relative condition factor were also observed. These findings indicate that Epistylis infestation in Brazilian catfish is an emerging disease in cultured fish.