Folia Parasitologica, vol. 56 (2009), issue 1

Folia Parasitologica 56[1] 55-63 (2009) | DOI: 10.14411/fp.2009.009

Goezia spinulosa (Nematoda: Raphidascarididae), a pathogenic parasite of the arapaima Arapaima gigas (Osteichthyes)

Cláudia Portes Santos1, František Moravec2
1 Laboratório de Avaliação e Promoção da Saúde Ambiental, Instituto Oswaldo Cruz - Fiocruz, Av. Brasil 4365, 21045-900 Rio de Janeiro, RJ, Brazil
2 Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic

The nematode Goezia spinulosa (Diesing, 1839) (Raphidascarididae) is redescribed based on specimens found in the stomach and intestine of the naturally infected arapaima Arapaima gigas (Schinz) from the Mexiana Island, Amazon River Delta, Brazil. Light and electron microscopy examinations revealed some previously unreported or inaccurately described morphological features in the species, such as the position of the excretory pore, phasmids in the male or the number (4) of postanal papillae. The morphology of G. spinulosa is compared with that of other four congeneric species parasitizing freshwater fishes in South America. This nematode seems to be one of the most pathogenic parasites of A. gigas in the Mexiana Island, which are responsible for a high mortality of cultured arapaima fingerlings. Apparently, the source of G. spinulosa infection for arapaima fingerlings cultured in tanks was the infected plankton collected in the localities inhabited by wild arapaimas. Therefore, control measures should include the sterilisation of the plankton before its use as food for fish. A rare infection of Eustrongylides sp. larvae (Dioctophymatidae) in arapaima fingerlings was also found (new host record); the larvae were inside swellings on the body surface.

Keywords: parasitic nematode, Goezia spinulosa, freshwater fish, Arapaima gigas, aquaculture, Amazonia, Brazil

Received: October 23, 2008; Accepted: January 9, 2009; Published: March 1, 2009


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