Çinkonun (Zn+2) Gümüş Balığı (Atherina boyeri, Risso, 1810) Üzerine Akut Toksisitesi

Abstract

In this study it was aimed to determine acute toxicity of zinc on sand smelt (Atherina boyeri). In the experiments were used sand smelt which have average length of 4.41±0.068 cm and weights 0.60±0.027 g. The test fish were exposed to following concentrations of zinc (7.78, 12.96, 21.6, 36, 60 and 100 mg/L) for 24 hours. In preparation of test solutions zinc sulphate and artesian water which has temperature 19° C, total hardness 350 mg/L CaCO3 and 5.72 mg/L DO. Test fish were placed in plastic containers to replications experimental groups as hourly and daily morphological observations were made and recorded time of death in acute toxicity test. In zinc-acute toxicity test were used static bioassay methods for 24 hour intervals. Data obtained from the zinc acute toxicity tests were evaluated using the Probit Analysis to LC50 and LT50. LC50 zinc concentrations values were ranged between 1.768 mg/L were observed. The longer the duration of zinc showed a decrease in the value of LC50. LC50 value of the application factor is applied (1.768x0.1) to sand smelt zinc maximum acceptable concentration (safe concentration), 0.1768 mg/L Zn+2, respectively. Lethal concentration, depending on the time interval is 1 hour and 5 minutes to 6 hours 27 minutes LT50 values ranged and decreases the concentrations of zinc have been found. During the experiment, the surface concentrations of fish depending on the movements of assembly and also the opposite effect and side swims away from a fast-moving, uncontrolled swimming, to escape out of the water movement, perpendicular to the water, swimming, breathing movements are observe