Detection of Acute Toxicity of Mercury Chloride in Yellowfin Sea Bream (Acanthopagrus Latus)

Aliakbar Hedayati¹*, Alireza Safahieh¹, Ahmad Savari¹ and Jasem Ghofle Marammazi²

¹Department of Marine Biology, Faculty of Marine Science, University of Marine science and Technology, Khorramshahr Iran.

²South Iranian Aquaculture Research Center, Ahwaz Iran.

ABSTRACT: Toxicity tests allow the determination of pollution effects, providing direct evidence of the biological responses of marine organisms to contaminants. The 96-h LC50 tests are conducted to measure the susceptibility and survival potential of organisms to particular toxic substances such as heavy metals. Hg2+ tested concentrations were 20, 50, 100, 200, 500, 1000, 2000, 5000 and10000 μg/l, Groups of six male yellow fine sea bream (120 g) were exposed for 96 h to each of the Range Finding Test for LC50, in fiberglass tank equipped with aeration with 100 l of test medium. According to Range Finding Test (fifty percent of mortality between 500 and 1000) another tested concentration 550, 650, 750, 850 and 950 μg/l, Groups of six male yellow fine sea bream were exposed for 96 h to each of the LC50 96h for test solutions. 24 h, 48 h, 72 h and 96 h LC50 were 962.75 886.48, 886.48 and 648.86 respectively. The 96 h NOEC, LOEC and LC50 were 500, 550 and 648.86 μg/l respectively. LC50 values indicated that mercury is more toxic to A. latus. LC50 obtained in the present study compare with corresponding values that have been published in the literature for other species of fish, show different LC50 of mercury in different species and even different time, but what is important, lower value of LC50 for A. latus compare with most species and confirm sensitively of A. latus to low mercury doses.

KEYWORDS: NOEC, LOEC; LC50; Mercury Chloride; Acanthopagrus latus

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