Embryo-toxicologie des poissons : les salissures biologiques : etoxicité du Mexel® 432, un agent anti-salissure industriel, vis-à-vis du développement précoce de la carpe commune (Cyprinus carpio L.)

Abstract : The launching of new molecules or procedures requires a laboratory tests to evaluate their intrinsic potential toxicity and hazards related to their utilization at the industrial level. A sytnhetic bibliography exposes the principal knowledge on the aquatic fouling and the treatments used or recommended in the industrial domain. An experimental study is carried out on the lethal effects of Mexel 432, a new antifouling agent, on the embryolarval development of the common carp (Cyprinus carpio L.) which was used as an ecotoxicological model. The principal characteristic of Mexel 432 and the common carp embryolarval test are presented. In synthetic water, at continuous exposure from fertilization without feeding, the mean LC50 measured were 1.13 +- 0.35 mg/L after 3 days of exposure, 0.88 +- 036 mg/Lafter 7 days and 0.69 +- 0.32 mg/L afer 9 days. The lowest and highest LC50 are 0.34 and 1.58 mg/L afer 7 days of exposure. At sublethal concentrations, the embryolarval growth is reduced. Histopathological examination seems to show that gill epithelium could to be affected. In natural water samples, the toxicity of Mexel 432 is immediately reduced related to an "immediate demand" of this product due to its adsorption on suspended matters (clays) or to its complexation with dissolved organic matters (humic acids). The essential of the Mexel toxicity involves its fatty-amines content. The adjunction of an antifreezing interfere with the normal sticking of eggs and thus, the principle of a quantitative method of this effect is proposed. The temperature, pH and the concentration of calcium have a little effect on Mexel toxicity. The latter has a little influence on the toxicity of various hydrophobic or hydrophilic xenobiotics. The use of standardized method of EDF (colorimetric dosage by methyl-orange in acidic medium), allows to reach, in laboratory water, a thresholds of detection and measurement respectively of 0.29 and 0.58 mg/L. The slope of the calibration curve is 18.02 +- 0.22 in the range of concentration 0.1-12.8 mg/L of Mexel
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Latifa Arehmouch. Embryo-toxicologie des poissons : les salissures biologiques : etoxicité du Mexel® 432, un agent anti-salissure industriel, vis-à-vis du développement précoce de la carpe commune (Cyprinus carpio L.). Sciences agricoles. Université Paul Verlaine - Metz, 1997. Français. ⟨NNT : 1997METZ032S⟩. ⟨tel-01777216⟩

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