3.9 Article

The occurence of black spot disease in Astyanax aff. fasciatus characiformes: characidae) in the Guaiba Lake basin, RS, Brazil

Journal

BRAZILIAN JOURNAL OF BIOLOGY
Volume 74, Issue 3, Pages 127-134

Publisher

INT INST ECOLOGY
DOI: 10.1590/1519-6984.08312

Keywords

prevalence; infection; parasites

Categories

Funding

  1. The Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [476821/2003-7]

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Black spot disease is common in freshwater fish and is usually caused by the metacercaria stage of digenetic trematodes, normally from the Diplostomidae family. The present study evaluated the prevalence and intensity of this disease in Astyanax aff. fasciatus (Teleostei: Characiformes) in the Guaiba Lake basin (RS, Brazil), including body parts assessment and the points of sampling with higher occurrence of black spots. Fish samples were taken seasonally from December 2002 until October 2004. The samples were collected with the use of a seine net at eleven points. The specimens were fixed in 10% formalin and stored in 70% ethanol. Black spot disease showed a low frequency in the Guaiba lake basin (2.07%) and no specificity to the species Astyanax aff. fasciatus was observed. A high prevalence among the individuals and high intensity of infection levels was found in the ventral and dorsal regions in relation to other body parts (e.g., pectoral, pelvic and anal regions). Among the sampling points studied, we observed a higher prevalence on samples collected at points Gasometro, Saco da Alemoa and Sinos, located in open areas with less occurrence of mollusks.

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