Abstract

VILLAMARIN-JIMENEZ, Sandra; CHACON-CASTRO, María Fernanda  and  ALVAREZ-LEON, Ricardo. ACUTE TOXICITY TESTS CL (I) 50 IN ESTUARINE FISH (Gambusia affinis) USING INDUSTRIAL EFFLUENTS TO THE BAY OF CARTAGENA, COLOMBIA. Biosalud [online]. 2013, vol.12, n.2, pp.24-39. ISSN 1657-9550.

Toxicity tests were carried out with two effluents of ALCO Ltda. (effluent Cospique wich discharges industrial waste and effluent Casimiro into which the cooling water is discharged) in order to analyze their effect on the G. affinis fish during an exposure period of 24, 48, 72, and 96 hours with static systems and without replacement. Regressions by ordinary minimum quadratic were carried out in the statistical analyses to determine the median lethal time and the toxicity curves. The values for LC (I) 50 and their confidence limits were found using the PROBIT method. With the Cospique effluent the percentages (%) and the exposure time found LC (I) 50 were of 15,91; 15,18; 15,18 and 15,12 for 24, 48, 72 and 96 hours respectively. As a consequence, the Cospique effluent is of a higher lethality, demonstrating their immediate effects. In the case of ALCO Ltda. it was found that to higher concentrations was highest the mortality and lesser the median lethal time. The industrial effluents studied are considered unstable because of the formation of chemical complexes resulting from their compounds.

Keywords : bioassays; toxicity; effluents; fishes; Colombia.

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