Determinación de la toxicidad aguda cl50 96h con acetato de cadmio en juveniles liptopenaeus vannamei y alevines de tilapia roja oreochromis sp
Cadmium is a heavy metal toxic effects on living organisms, even in very small concentrations. Bioassays have been the traditional method to document the presence or absence of apparent effects of pollutants on living systems. Lethal or acute toxicity tests (LC50) to assess the main effects of pollu...
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| 格式: | bachelorThesis |
| 语言: | spa |
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2014
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| 主题: | |
| 在线阅读: | http://repositorio.utmachala.edu.ec/handle/48000/1986 |
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添加标签 | 总结: | Cadmium is a heavy metal toxic effects on living organisms, even in very small concentrations. Bioassays have been the traditional method to document the presence or absence of apparent effects of pollutants on living systems. Lethal or acute toxicity tests (LC50) to assess the main effects of pollutants on the structure of organisms or aquatic populations in the short term. 40 aquarium plastic 2 liter capacity were used, each of these were placed on 100% water whose physicochemical characteristics were similar to those of the medium used in the acclimatization of animals, monitoring the temperature values, oxygen and pH of the water selected. The observations regarding the number of shrimp and red tilapia fingerlings survivors were performed after periods met 24, 48, 72 and 96 hours. The mean lethal concentration (LC50) was determined in dose Acetate cadmium fry red tilapia (Oreochromis sp.) To the present investigation, it was considered according to the statistical analysis Probit, the average dose delivered was 0, 61 mg / l and the median lethal concentration (LC50) in doses of cadmium acetate larval shrimp (Litopenaeus vannamei) was 0.58 mg / l. Cadmium Acetate has a high power of toxicity, being able to produce excessive mortalities in high concentrations in both red tilapia fry and shrimp larvae. Red tilapia fingerlings were more resistant to the toxicity of cadmium acetate (CH3COO) 2Cd2H2O shrimp larvae. |
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