Resumen

FIGUEROA-LUCERO, Gerardo; HERNANDEZ-RUBIO, María Cecilia  y  GUTIERREZ-LADRON DE GUEVARA, Miguel de Jesús. Acute Toxicity of Ammonia on Macrobrachium tenellum (Smith) larvae. Rev. Int. Contam. Ambient [online]. 2012, vol.28, n.2, pp.145-150. ISSN 0188-4999.

The prawn shrimp Macrobrachium tenellum is a potential species for culture in México. The effect of ammonia on larvae was evaluated to provide basic information on safe levels for larviculture. A 72 h static assay was performed on 5 days old M. tenellum larvae. The nominal concentrations tested ranged from 2.89 to 185.48 mg NH₄-N/L which represent 0.103 to 6.585 mg NH₃-N/L at 20 g/L salinity, 28 °C and pH 7.79. LC₅₀ for 12, 24, 48 and 72 h were 2.939 ± 0.505, 0.749 ± 0.301, 0.477 ± 0.163 and 0.409 ± 0.068 mg NH₃-N/L, respectively. These results suggest that M. tenellum exhibits a slightly higher tolerance to ammonia in the zoea stage when compared to most of the prawn and shrimp species.

Palabras llave : river shrimp; prawn; zoea; tolerance.