Concentraciones De Metales en Sedimentos Y Tejidos Musculares De Algunos Peces De La Laguna De Castillero, Venezuela.

To detected alterations in the productive ecosystem of theCastillero Lagoon (Caicara of the Orinoco, Cedeño Municipality,Bolivar State, Venezuela), results are presented for granulometric measurements and heavy metals concentrations: Fe, Mn, Zn, Pb and Co made in June 2001 on superface sediments and of the muscular tissue of several native species of fish (Plasgiosium squamossimos, Pigocentrus cariba, Pheudoplastylomafasciatum, and Hypostomus spp. By using atomicabsorption spectrophotometry with an air-acetylene flame, itwas determined that the highest concentrations of metals are represented by manganese, zinc and lead. It was determined that the highest concentrations of metals are represented by manganese, zinc and lead. In the most internal part in the lagoon the type of predominant sediments is the mud, constituting among 30% and 65% of the material collected by station. Is that those levels fall toward the mouth of the lagoon, product of the interaction of the flow / reflux currents that washes the sediment and that is reflected in the biggest presence of fine sand. The statistical analysis of ANOVA shows significant differencesamong the concentrations of the metals in the stations,tipificated for the presence of different averages. The averages levels for the superficial sediments of the area are the following ones: Fe (3365.44 ± 261.61), Mn (132.17 ± 25.46), Zn (253.04 ± 86.48), Pb (17.02 ± 2.21) y Co (4.65 ± 0.76) μg/g. In similarly way, in the muscular tissue of the fish the following concentrations were quantified: Fe between (31.26 ± 0.06) and (68.36 ± 0.05); Mn between (2.02 ± 0.05) and (4.16 ± 0.03); Zn between (19.09 ± 0.01) and (28.89 ± 0.01); Pb between (0.38 ± 0.01) and (0.47 ± 0.03) μg/g. The analysis reflects a remarkable association between the high securities of concentrations of metals and the sediments type, with a growing gradient towardthe sediments type mud. These are alarming values inconcentration of Pb and Zn, attributed to the stress that produces the anthropogenic activities surrounding the Lagoon of Castillero. It can be concluded that based on the diagnosis that the ecosystem of the lagoon is in evident state of deterioration with implications that could affect the species inhabit, and the economic activities of the population that exploit the resources biotiques of that body of water.