Polychlorinated biphenyl accumulation and hepatic EROD activity in golden grey mullet Liza aurata from Tunis Bay, southern Mediterranean

  • W Masmoudi
  • MS Romdhane
  • S Khériji
  • El Cafsi

Abstract

Liza aurata was used as a bioindicator species to monitor contamination by organic xenobiotics of estuarine water at the outlet of Khélij channel [canal], Tunisia, from November 2002 to December 2003. Polychlorinated biphenyl (PCB) concentrations, including coplanar congeners, were measured in mullet muscle tissue. Mean PCB concentrations ranged between 77 and 180 ng g–1 wet weight. The PCB profiles were dominated by hexachlorobiphenyl congeners accounting for 25–52% of the total profiles. Total 2,3,7,8-tetrachlorodibenzo-p-dioxin toxic equivalents of coplanar PCBs, including mono- and non-ortho congeners, was 4 pg g–1 wet weight in December 2003 vs 82 pg g–1 wet weight in April 2003. Biological effects in mullet were evaluated by measuring ethoxyresorufin-o-deethylase (EROD) activity in fish liver. EROD activity was significantly elevated, compared to baseline values in control fish (43 ± 23 pmol min–1 mg–1 protein). The highest enzymatic activity of 1 202 ± 813 pmol min–1 mg–1 protein was recorded in July 2003.

Keywords: bioindicator, biomarker, pollution assessment

African Journal of Aquatic Science 2011, 36(2): 159–165

Author Biographies

W Masmoudi
UR Physiologie et Ecophysiologie des Organismes Aquatiques, Département des Sciences Biologiques, Faculté des Sciences de Tunis, Campus universitaire, 2092 Tunis, Tunisia; Current address: Institut Supérieur de Pêche et d’Aquaculture de Bizerte, Rimel 7080, BP 15, Bizerte, Tunisia
MS Romdhane
UR Ecosystèmes et Ressources Aquatiques, Institut National Agronomique de Tunis, 43 av. Charles Nicolle 1082 Tunis, Tunisia
S Khériji
UR Physiologie et Ecophysiologie des Organismes Aquatiques, Département des Sciences Biologiques, Faculté des Sciences de Tunis, Campus universitaire, 2092 Tunis, Tunisia
El Cafsi
UR Physiologie et Ecophysiologie des Organismes Aquatiques, Département des Sciences Biologiques, Faculté des Sciences de Tunis, Campus universitaire, 2092 Tunis, Tunisia
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Articles

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eISSN: 1727-9364
print ISSN: 1608-5914