1. a Department of Toxicology , National Institute of Health , PO Box 769, Agdal, Rabat, Morocco
2. b Département Milieux aquatiques , CEMAGREF, Groupement de Lyon , 3bis, quai Chauveau, CP 220, F-69336 Lyon cedex 09, France
3. c IAEA, Marine Environment Laboratory , 4 quai Antoine 1er, MC 98000, Monaco
4. d Faculty of Science Dhar El Mahrez , Laboratory of Environmental Microbiology , PO Box 1796, Fes, Morocco
5. e Laboratory of Pollution, Ecotoxicology and Sanitary Risk, Scientific institute, University Mohamed V , PO Box 703, Rabat, Morocco
6. f National Centre for Food Quality and Risk Assessment, Istituto Superiore di Sanità , Viale Regina Elena, 299, I-00161 Rome, Italy