Uptake and elimination of chromium in Cnesterodon decemmaculatus; Pisces: Poeciliidae, after sub-chronic experimental exposure

MARÍA J. PARMA; MIRTA CAMPANA; ALICIA LOTESTE

FRESENIUS ENVIRONMENTAL BULLETIN

Fresenius Environmental Bulletin

Año: 2008 vol. 17 p. 293 - 297

1018-4619

The objetive of this study was to evaluate the capacity of bioconcentration and elimination of chromium by Cnesterodon decemmaculatus in experimental conditions. PVC tanks (800L), with a sandy, kaolinite and turf sediment were used. Amounts of 3 and 6 mg Cr/L of potasium dichromate in dechlorinated water were added to the sediment using two replicates per concentration and control. After 5 days of stabilization, 125 specimens (1.7-2.8 cm total length) from our own cultures were placed in each tank. Water, sediment and fish (10 specimens pooled) samples were taken at 1,7,14 and 28 days during the accumulation phase. Temperature, dissolved oxygen, conductivity, ph, and salinity were daily registered. The bioconcentration factors (tissue/water) were 3.51 and 4.00 for 3 and 6 mg Cr/L levels, respectively, after 7 days; 2.15 and 1.97 at 14 th day, and 6.15 and 2.63 at 28 th day of the accumulation phase. After 14 days, the depuration phase revealed 100% elimination at 3 mg Cr/L and approximately 61% elimination at 6 mg Cr/L: