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Lethal effects of elevated pH and ammonia on juveniles of neotropical fish Colosoma macropomum (Pisces, Caracidae).
J Environ Biol ; 2004 Jan; 25(1): 7-10
Artículo en Inglés | IMSEAR | ID: sea-113555
ABSTRACT
Ammonia is the main nitrogenous waste material excreted by gills, then is oxided first to nitrite and then to nitrate. The proportion of ionized-un-ionized ammonia depends on pH and temperature, when this variables increase in a solution containing ammonia the equation goes to left, so the proportion of NH3 increases and the solution becomes more toxic. The purpose of this study was to investigate the acute lethal effects of elevated pH and ammonia on tambaqui juveniles. With a constant ammonia concentration of 5.0 mg/l NH3, there was no mortality a pH of 6.0 (control) and 7.0; but was of 10-20% a pH of 8.0 and 100% at 9.0. The lethal effects of elevated pH and un-ionized ammonia should be recognized as a potential factor contributing to the variable success of tambaqui production ponds, but this species is highly resistant in comparison with other freshwater fish.
Asunto(s)
Texto completo: Disponible Índice: IMSEAR (Asia Sudoriental) Asunto principal: Contaminantes del Agua / Líquidos Corporales / Factores de Edad / Compuestos de Nitrógeno / Peces / Agua Dulce / Branquias / Amoníaco / Concentración de Iones de Hidrógeno / Iones Idioma: Inglés Revista: J Environ Biol Año: 2004 Tipo del documento: Artículo

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Texto completo: Disponible Índice: IMSEAR (Asia Sudoriental) Asunto principal: Contaminantes del Agua / Líquidos Corporales / Factores de Edad / Compuestos de Nitrógeno / Peces / Agua Dulce / Branquias / Amoníaco / Concentración de Iones de Hidrógeno / Iones Idioma: Inglés Revista: J Environ Biol Año: 2004 Tipo del documento: Artículo