Detection of Range Finding Test of Mercury Chloride Inyellowfin Sea Bream (Acanthopagrus Latus)

Toxicity tests allow the determination of pollution effects, providing direct evidence of the biological responses of marine organisms to contaminants. fifty four yellow fine sea bream (acanthopagrus latus) all immature male in same size (120 g final body weight average) were obtained from mahshahr creeks with hooks in a upon capture. in laboratory fish maintained in a seawater re-circulatory system (300-l tanks) equipped with physical/biological filters and with aeration. all samples were acclimatized for one weeks in a 15 aerated fiberglass tank containing 46 ppt saltwater maintained at 25 c under a constant 12:12 l:d photoperiod. acclimatized fish were fed daily with a live feed (fresh shrimp) and daily we checked water quality and water parameters. hgcl tested concentrations were 20, 50, 100, 200, 500, 1000, 2000, 5000 and10000 μg/l, groups of 2 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. the control group was exposed to filtered sea water in similar conditions. test medium was not renewed during the assay and no food was provided to the animals. values of ph, temperature and salinity were measured at time 0, 24, 48, 72 and 96 h. at the end of the bioassay, range values were determined as 500-1000 μg/l (fifty percent of mortality between 500 and 1000). range finding test values indicated that mercury is more toxic to a. latus than other same marine spices. range obtained in the present study compare with corresponding values that have been published in the literature for other species of fish, show different range of mercury in different species and even different time, but what is important, lower value of range finding test for a. latus compare with most species and confirm sensitively of a. latus to low mercury doses.