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- W2036627409 abstract "Studies conducted on the distribution, fate and metabolism of DDT in a model ecosystem simulating a tropical marine environment of fish, Gobious nudiceps, Lethrinus harak, Gobious keinesis, Gobious nebulosis and white shrimp (Panaeus setiferus), show that DDT concentration in the water decreases rapidly within the first 24 h. Rapid accumulation of the pesticide in the biota also reaches a maximum level in 24 h before gradually declining. The bioaccumulation factors calculated for the fish species (G. keinesis) and white shrimp (P. Setiferus) were 270 and 351, respectively, after 24 h. There was a steady build up of DDT residues in the sediment during the first 24 h which continued to a maximum concentration of 6.66 ng/g in the seawater/fish/sediment ecosystem after 3 weeks and 5.27 ng/g in the seawater/shrimps/sediment ecosystem after 2.7 days. The depuration of the accumulated pesticide was slow with only 54% lost in G. nudiceps within 3 days of exposure in fresh sea water. By contrast, depuration was fast in the white shrimp, which lost 97% of the accumulated pesticide under the same conditions. DDT was found to be toxic to two of the fish species (G. nebulosis and L. harak) and to white shrimp, and the degree of toxicity was dependent on the particular species. The 24 h LC50 at room temperature for the fish species G. nebulosis and white shrimp was found to be 0.011 and 0.116 mg/kg, respectively. These levels are comparable to the ones recorded for the temperate organisms. Degradation of DDT to its primary metabolites, DDE and DDD, was found in all the compartments of the ecosystem with DDE being the major metabolite in the fish, shrimps and sediment, while in seawater, DDD dominated as the major metabolite." @default.
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- W2036627409 date "2003-07-01" @default.
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- W2036627409 title "The distribution, metabolism and toxicity of<sup>14</sup>c-DDT in model aquarium tanks with fish and sediment simulating a tropical marine environment" @default.
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- W2036627409 doi "https://doi.org/10.1080/02772240410001665535" @default.
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