Median Lethal Concentration (LC sub(50)) for Suspended Sediments in Two Sturgeon Species, Acipenserpersicus and Acipenser stellatus Fingerlings

摘要

Median lethal concentration (LC sub(50)) of suspended sediments in the Sepidrud River on two sturgeon species Acipenser persicus and Acipenser stellatus were determined to provide reliable criteria and guidelines for the protection of aquatic resources. Static bioassays were performed for 24 and 96 h periods on A. persicus and A. stellatus one control was used for A. persicus. Three replicates were used for each trial. Ten fish were stocked in each aquarium (35x30x35 cm super(2)) containing 30 L of water. pH, dissolved oxygen concentration and water temperature was measured and recorded throughout the experimental period. The LC sub(50) for 24 and 96 h for median lethal concentration were determined following Probit analysis. The LC sub(50) for 24 and 96 h for suspended sediments was 46294 and 8539 mg L super(-1) in A. stellatus fingerlings, respectively. However, A. persicus fingerlings showed higher tolerance and median lethal concentration for suspended sediments but this species LC sub(50) was 15367 mg L super(-1) for 96 h and 60802 mg L super(-1) for 24 h.