Parlak, Hatice Ege Üniversitesi - Su Ürünleri Fakültesi - Temel Bilimler Bölümü, Turkey , Arslan, Özlem Çakal Ege Üniversitesi - Su Ürünleri Fakültesi - Temel Bilimler Bölümü, Turkey , Boyacioglu, Meltem Ege Üniversitesi - Su Ürünleri Fakültesi - Temel Bilimler Bölümü, Turkey , Karaaslan, Muhammed Ali Ege Üniversitesi - Su Ürünleri Fakültesi - Temel Bilimler Bölümü, Turkey

Acute and Chronic Toxicity of Contaminated Fresh Water and Sediment of Nif Brook on Daphnia magna (Straus, 1820)

14406

The water and sediment of Nif Brook (Izmir, Turkey) is polluted by effluents have been discharged directly or treated from industrial, domestic and agricultural sources. As the water of the brook used for domestic and industrial water supply as well as for purpose of irrigation, it has a great importance to know the toxicity potential on the natural populations. The aim of this study is to define the water and sediment toxicity of certain streams Nif Brook by using the water flea Daphnia magna Strauss as a test organism. The toxic contents of collected water were diluted and sediments were used as an extract. The lethal toxicity of waters and sediments were evaluated by using the 48- h acute toxicity test. And also sub-lethal toxicity of waters and sediments were evaluated by using 7-days chronic toxicity test. According to acute test results average 48 h LC50 for D.magna between 6.8 to 12.67 μl/L for water samples, between 6.83 to 38.0 μg/L for sediment samples of 4 stations in Nif Brook were found and then D.magna were exposed to sub-lethal concentrations of 4 stations in this stream, the results show that all of the streams and their elutriates produced negative effects. Results of this study showed that, screening the toxicity of polluted waters and sediments by using D.magna gives better and more meaningful results than an quantitative analyze of toxic matters.

135

Nif Brook , Daphnia magna , Acute Toxicity , Chronic Toxicity

Ege Journal Of Fisheries an‎d Aquatic Sciences

141