Micronucleated erythrocytes frequency and radiocesium bioconcentration in pikes (Esox lucius) caught in the Tom River near the nuclear facilities of the Siberian Chemical Complex (Tomsk-7).
Between 1957 and 1993, the Siberian Chemical Complex (Tomsk-7) located in the Tomsk region (Russia) regularly discharged radioactive liquid wastes into the Tom River which resulted in an extensive contamination of large territories with long lived radionuclides such as cesium-137 and strontium-90. In the summers of 1996 and 1997, Research Team of Siberian Medical University conducted biodosimetry and cytogenetic monitoring of pikes (Esox lucius) caught in the Tom River at various distances downstream from the Siberian Chemical Complex (SCC) using the micronucleus test and the gamma spectroscopy. Our findings demonstrated that the difference in frequency of micronucleated erythrocytes between the radiation-exposed fish caught downstream from the SCC and the controls was statistically significant (P < 0.01). Moreover, we found a good correlation between radiocesium concentration and micronucleated erythrocyte frequency in pikes. It was found that both the micronucleated erythrocyte frequency in pike blood and the level of the pike radiocesium concentration depended on the age of pikes. The micronucleated erythrocyte frequency gradually increased from the 1-year-old pikes to the over 20-year-old pikes. On the other hand, the average level of radiocesium concentration gradually increased from the 1-year-old pikes only up to the 10-year-old pikes. There is no correlation between radiocesium concentration and micronucleated erythrocyte frequency in the over 10-year-old pikes.
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Siberian Medical University, Russian Federation. root@ecogen.tomsk.su
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D000367:Age Factors; D000818:Animals; D002588:Cesium Radioisotopes / Q000009:adverse effects* / Q000032:analysis; D004912:Erythrocytes / Q000528:radiation effects* / Q000648:ultrastructure; D017859:Esocidae / Q000097:blood*; D005260:Female; D005618:Fresh Water / Q000032:analysis; D008297:Male; D048629:Micronuclei, Chromosome-Defective / Q000528:radiation effects*; D015162:Micronucleus Tests; D011210:Power Plants; D012800:Siberia; D014875:Water Pollutants, Radioactive / Q000009:adverse effects* / Q000032:analysis
D002588:Cesium Radioisotopes; D014875:Water Pollutants, Radioactive