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Xu, Y.* ; Zhang, J.* ; Li, W.* ; Schramm, K.-W. ; Kettrup, A.

Endocrine effects of sublethal exposure to persistent organic pollutants (POPs) on silver carp ( Hypophthalmichthys molitrix).

Environ. Pollut. 120, 683-690 (2002)

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Silver carp (Hypophthalmichthys molitrix) samples were collected from five selected sites that represent diverse levels of downgraded persistent organic pollutants (POPs) contamination in Ya-Er Lake in October 1999. Hepatic ethoxyresorufin-O-deethylase (EROD) and UDP glucuronosyltransferase (UDPGT) activities, hepatosomatic index (HSI), hepatic retinoids, serum thyroid hormones were measured. It was found that hepatic retinol and serum free 3,5,3′- tetraiodothyronine (FT₃) significantly increased (P<0.01) when both hepatic EROD and UDPGT activities significantly declined (P<0.01) from pond 1 to 5 with decrease in the degree of pollution. This significant negative correlation (P<0.01) suggests that the persistent organochlorinated contaminants could induce hepatic EROD and UDPGT activities, alter retinoid and thyroid hormone homeostasis, and finally lead to the reduction of retinol and FT₃, the two biologically active forms of retinoids and thyroid hormone in silver carp of Ya-Er Lake.

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