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Latin american journal of aquatic research

versión On-line ISSN 0718-560X

Resumen

OCHOA, José Luis et al. Isolation and risk assessment of Geotrichum spp. in the white shrimp (Litopenaeus vannamei Boone, 1931) from culture ponds. Lat. Am. J. Aquat. Res. [online]. 2015, vol.43, n.4, pp.755-765. ISSN 0718-560X.  http://dx.doi.org/10.3856/vol43-issue4-fulltext-14.

The present study was done in order to identify the fungus invading some of the supralittoral ponds used for shrimp aquaculture in the CIBNOR facilities in La Paz, Baja California Sur (BCS), México during the summer season. From the walls and bottoms of the ponds, two strains of Geotrichum spp. were isolated and morphologically identified. Fungal adhesion towards hemocytes and primary cultures of various white shrimp (Litopeneaus vannamei) tissues (gill, tegument, and gut) was analyzed to determine infectivity. Extracellular protease, lipase, and amylase activity were evaluated as virulence factors. Survival of shrimp post-larvae (PL8) exposed to fungal culture supernatant or to their filaments was also investigated. The results showed that shrimp tegument cells and hemocytes were very susceptible to Geotrichum spp. invasion, and that this fungus provokes great mortality of post-larvae. Hence, Geotrichum spp. could be considered an opportunistic pathogen that might represent a serious health risk to shrimp in culture.

Palabras clave : Geotrichum spp; Fusarium solani; Litopenaeus vannamei; mycotoxins; extracellular enzymes; aquaculture.

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