Acute and chronic toxicity of ammonia in Persian sturgeon, Acipenser persicus, fingerlings

Shahram Naghizadeh Raiesi, Mohammad Mazandarani, Seyed-Ahmad Shahidi, Azade Ghorbani-HasanSaraei, Fatemeh Khani, Sjad Fatahi

Abstract

In the present study, susceptibility of Persian sturgeon, Acipenser persicus, to un-ionized ammonia (UIA) was studied. Fish with an average weight of 5.52±0.45 g were exposed to different concentrations of un-ionized ammonia (UIA) to determine median lethal concentration (96-h-LC50). The fish were exposed to six different concentrations of UIA (control, 0.16, 0.31, 0.62, 0.94 and 1.25 mg/l UIA). The control group was not challenged with ammonia (0.0008 mg/l UIA). The results showed that the 96-h-LC50 of UIA in Persian sturgeon was 0.46 mg/l. According to 96-h-LC50,mid-term exposure to sub-lethal UIA was examined. In the chronic examination, the fish were exposed to different levels of sub-lethal ammonia; control (0.0008 mg/l UIA), 10% of LC50 (0.05 mg/l UIA), 5% of LC50 (0.025 mg/l UIA) and 1% of LC50 (0.005 mg/l UIA) for 30 days. Final length, final weight, weight gain, specific growth rate, daily weight gain and body weigh index decreased significantly in the fish exposed to 0.05 and 0.025 mg/l UIA. According to the results, conversion ratio and condition factor indices were higher in the fish exposed to 0.005 mg/l UIA and control group compared with the fish exposed to 0.05 and 0.025 mg/l UIA.

Keywords

Sturgeon, Ammonia, LC50, Growth performance, Toxicity.

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