SAPROLEGNIASIS IN WILD SILVERSIDE Odontesthes bonariensis (PISCES: ATHERINOPSIDAE) OF ARGENTINA

• Autor(a) principal: Mancini, Miguel
• Data de Publicação: 2010
• Outros Autores: Rodriguez, Claudia, Barberis, Carla, Astoreca, Andrea, Brol, Germán
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Brazilian Journal of Veterinary Medicine
• Texto Completo: https://rbmv.org/BJVM/article/view/833
• topic: Peixe-rei; Odontesthes bonariensis; Saprolegnia parasítica; lagoa pampeana; Silverside; Odontesthes bonariensis; Saprolegnia parasitica; Pampean shallow lake

ABSTRACT. Mancini M., Rodriguez C., Barberis C., Astoreca A. & Brol G. [Saprolegniasis in wild silverside Odontesthes bonariensis (Pisces: Atherinopsidae) of Argentina]. Registro de saprolegniasis en ejemplares silvestres de pejerrey Odontesthes bonariensis (Pisces: Atherinopsidae) de Argentina. Revista Brasileira de Medicina Veterinária, 32(1):46-50, 2010. Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Ruta Nac. 36 km 601, 5800, Río Cuarto, Cordoba, Argentina. E-mail: [e-mail] Mortality in wild silverside Odontesthes bonariensis was investigated in a pampean shallow lake (33º26´W, 64º50´S, 85 ha), located in Cordoba Province. An outbreak was detected at the end of winter in 2007. Water quality variables were analyzed and living and agonizing fishes were captured for postmortem studies. Water values for pH, temperature, transparency and zooplankton abundance were: 9.0±0.3, 14.2±0.5ºC, 46.2±2.3 cm and 111,822±30,150 org/m3 , respectively. Concentrations of NO3 y NO2 were under the referred acceptable limits. Loss of equilibrium, lethargy, and typical signs of bilateral skin mycosis were observed in the fishes. Saprolegnia parasitica was identified as the etiologic agent. Only 17.6% of the individuals showed small external hemorrhage, whereas the parasitic studies of the skin and gills resulted negative. The low water temperature during the days before the mortality could have been an important developing factor in this outbrake.