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espanolL a toxicidad aguda de seis lodos de perforacion (base agua y base sintetico) fue evaluada utilizando postlarvas de Litopenaeus vannamei con la finalidad de establecer la concentracion letal media a 96 h (CL50). La Fase Suspendida Particulada (FSP) de cada lodo fue usada como material de prueba. Cada FSP de los lodos fue evaluada usando cinco concentraciones de prueba con cuatro replicas de cada una, incluido el control. Los valores de CL50 obtenidos de la FSP de los Lodos Base Agua (LBA) se encontraron entre 4224 ppm y 26635 ppm y entre 40781 ppm y 308248 ppm para los Lodos Base Sintetica (LBS). El protocolo de ensayo para toxicidad aguda con esta especie se valido mediante una carta control con el toxico de referencia (dicromato de potasio). Litopenaeus vannamei mostro tener las condiciones requeridas para ser usado en pruebas de toxicidad aguda. Este trabajo es pionero en Colombia para evaluar los efectos de los lodos de perforacion con un organismo marino local. portuguesA toxicidade aguda de seis lamas de perfuracao (base agua e base sintetica) foi avaliada utilizando postlarvas de Litopenaeus vannamei com a finalidade de estabelecer a concentracao letal media a 96 h (CL50). A Fase Suspensa Particulada (FSP) de cada lama foi usada como material de prova. Cada FSP das lamas foi avaliada usando cinco concentracoes de prova com quatro replicas de cada uma, incluido o controle. Os valores de CL50 obtidos da FSP das Lamas Base Agua (LBA) estavam entre 4224 ppm e 26635 ppm e entre 40781 ppm e 308248 ppm para as Lamas Base Sintetica (LBS). O protocolo de ensaio para toxicidade aguda com esta especie foi validada mediante uma carta controle com o toxico de referencia (dicromato de potassio). Litopenaeus vannamei mostrou ter as condicoes necessarias para ser usado em provas de toxicidade aguda. Este trabalho e pioneiro na Colombia para avaliar os efeitos das lamas de perfuracao com um organismo marinho local. EnglishA cute toxicity of six drilling muds (water based and synthetic based) was evaluated using Litopenaeus vannamei postlarvae to establish the 96 h median lethal concentration (LC50). The Suspended Particulate Phase (SPP) of each drilling mud was used as test material. Each mud SPP was evaluated using five test concentrations, and four replicates of each were used including the control. LC50 values obtained ranged from 4224 ppm to 26635 ppm for Water Based Mud (WBM) and from 40781 ppm to 308248 ppm for Synthetic Based Mud (SBM). The test protocol for acute toxicity for this species was validated through a control chart with the reference toxicant potassium dichromate. Litopenaeus vannamei clearly showed the required conditions to be used in acute toxicity tests. This research is pioneer in Colombia to determine the effects of drilling muds using a local marine organism.

Acute toxicity of drilling muds on Litopenaeus vannamei (Boone, 1931) postlarvae