Toxicity of aromatic hydrocarbons to several species of molluscs from Shatt Al-Arab river

Al, H.T.; Saadb,; A.H.Y. Al, And; Farida, W.A.; Adhubc,

	Toxicity of aromatic hydrocarbons to several species of molluscs from Shatt Al-Arab river
Marsh Bulletin
Article 1, Volume 5, Issue 1, 2010, Pages 103-117 PDF (0 K)
Authors
H.T. Al; ; and A.H.Y. Al; W.A. Farida;
Abstract
The present study includes toxicity experiments carried out under laboratory conditions for 24- and 48- hours periods by using renewal toxicity test system to determine the comparative toxicities of three types of aromatic hydrocarbons{hydroxylated aromatic hydrocarbon (phenol and β–naphthol), azaarenes (quinoline and acridine) and polycyclic aromatic hydrocarbons (naphthalene and phenanthrene)} to several species of molluscs found in Shatt Al–Arab river. These species of molluscs are snails,Lymnaea auricularia,Theodoxus jordani,Physa acuta,Melanopsis nodosa,and Melanoides tuberculata and bivalves,Corbicula fluminea and Corbicula fluminalis. The toxicity experiments show that the more toxic aromatic compounds to species of molluscs is phenanthrene and the less toxic is quinoline. In each of these types of aromatics,the compound with the greater number of aromatic rings always exert a greater toxicity to species of molluscs. The order of sensitivity of molluscs tested to aromatic hydrocarbons are as follows : L. auricularia> P. acuta > M. nodosa > T. jordani > M. tuberculata > C. fluminalis > C. fluminea . The overall acute effects of hydrocarbons on the species of molluscs tested are abnormal activities,narcosis and anesthesia,the loss of ability to react to the external cue,rapture the tissues and die.

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