Di-2-ethylhexyl phthalate and di-n-butyl phthalate in tissues of common carp (Cyprinus carpio l.) after harvest and after storage in fish storage tanks

The aim of the present study was to determine whether the influence of fish pond and fish storage tank conditions change the content of phthalic acid esters (di-n-butyl phthalate (DBP) and di-2-ethylhexyl phthalate (DEHP)) in the carcass of the Common carp. Samples obtained from the autumn harvest of two fish ponds (R1 and R2) in 2007 and 2010 from the South Moravia and after a seven-week-long storage in fish storage tanks were analyzed. It was found that in the samples (2007) from both fish ponds after storage in fish storage tanks the content of DBP increased, for R1 from 0.56 plus minus 0.39 mg per kg to 0.83 plus minus 0.26 mg per kg and for R2 from 0.31 plus minus 0.08 mg per kg to 0.35 plus minus 0.11 mg per kg of original weight. Concerning DEHP, in samples obtained from the fish pond R1 after storage in fish storage tanks the mean concentration increased from 0.26 plus minus 0.23 mg per kg to 0.72 plus minus 0.16 mg per kg and from R2 it decreased from 0.71 plus minus 0.17 mg per kg to 0.12 plus minus 0.18 mg per kg of original weight. The experiment conducted in 2010 should have confirmed or disconfirm this trend. The average value of the DBP contents for R1 increased slightly from 0.15 plus minus 0.04 mg per kg after harvest to 0.18 plus minus 0.05 mg per kg of original weight after the storage in fish storage tank and for R2 from 0.09 plus minus 0.03 mg per kg after harvest to 0.16 plus minus 0.06 mg per kg of original weight after storage in fish storage tank. Similarly, an increasing tendency also occurred for DEHP, for R1 the value of 0.08 plus minus 0.02 mg per kg after harvesting increased to 0.14 plus minus 0.04 mg per kg of original weight after storage in fish storage tank and for R2 from 0.09 plus minus 0.03 mg per kg after harvesting to 0.16 plus minus 0.06 mg per kg after storage in fish storage tank. For all samples in both lakes in 2007 as well as in 2010 both phthalates showed slightly increasing trend except for DEHP in samples collected in 2007 from the fish pond R2.