An ultrastructural and histopathological study of Henneguya pellucida n. sp. (Myxosporea: Myxobolidae) infecting Piaractus mesopotamicus (Characidae) cultivated in Brazil

Parasite

and N.S. Cordeiro¹  S. Arana³  E.A. Adriano² 

[1] Departamento de Parasitologia, Instituto de Biologia, Universidade Estadual de Campinas-UNICAMP,Caixa postal 6109,CEP 13083-970,Campinas,SP,Brazil;Centro Universitário da Fundação de Ensino Octávio Bastos-UNIFEOB,São João da Boa Vista,SP,Brazil;Departamento de Histologia e Embriologia, Instituto de Biologia, Universidade Estadual de Campinas - UNICAMP,Caixa postal 6109,CEP 13083-970,Campinas,SP,Brazil

关键词: Brazil;    histopathology;    ultrastructure;    Piaractus mesopotamicus;    Characidae;    Myxosporea;    Henneguya pellucida n. sp.;   

Others  :  808766
DOI  :  doi:10.1051/parasite/2005123221

 received in 2005-01-10, accepted in 2005-04-14,  发布年份 2005

【 摘 要 】

During a study of myxosporean parasites of cultivated freshwater fish, a new myxosporean species, Henneguya pellucida n. sp., was discovered. Of the 120 Piaractus mesopotamicus sampled, only 10 specimens (8.3%) were infected. Yellow, round plasmodia measuring 0.5-3 mm were found in the serous membrane of the visceral cavity and in the tunica externa of the swim bladder. Sporogenesis was asynchronous, with the earliest developmental stages aligned prevailingly along the endoplasmic periphery and mature spores in the central zone. The mature spores were pear shaped (total length: 33.3 ± 1.5 μm, mean ± SD; width: 4.1 ± 0.4 μm; body length: 11.4 ± 0.3 μm; caudal process length: 24.1 ± 1.5 μm). The polar capsules were elongated (length: 4.0 ± 0.4 μm; width: 1.6 ± 0.2 μm). The development of the parasite in the swim bladder produced thickening of the tunica externa and a granulomatous reaction. There was no correlation between the prevalence of the parasite and the chemical and physical characteristics of the water. Infection was recorded only in juvenile specimens ranging in size from 9.5 to 20 cm.

【 授权许可】

   
© PRINCEPS Editions, Paris, 2005