Determination of oxidative stress in scaly carp (Cyprinus carpio Linnaeus, 1758) exposed to deltamethrin in different water temperature

In this study, it was aim to investigate oxidative stress in scaly carp (Cyprinus carpio) exposed to delthamethrin in different temperatures. For this purpose, fish were stocked to six different glass aquarium which was adjusted to 23 °C water temperature with adjustable thermostat heaters. After fifteen days adaptation period, temperatures of the two aquarium were dropped to 18 °C, while temperatures of the other two were upgrade to 28 °C. These groups were exposed to 0.036 μg/L concentration of deltamethrin for 14 days. At the end of the experimental period, the liver and gills were collected. Malondialdehyde (MDA) level as an indicator of lipid peroxidation, reduced glutathione (GSH) level and glutathione S-transferase (GST) activity were determined in these samples. The MDA levels were increased in the liver and gill of the groups at 18 °C and 28 °C when compared to the control group. The liver and gill MDA levels of the groups treated deltamethrin simultaneously with the change in temperature were higher than the groups at 18 °C and 28 °C. This increase was also observed in the group treated deltamethrin at 23 ºC. The GSH levels and GST activities were decreased in the liver and gill of the groups at 18 °C and 28 °C when compared to the control group. The GSH level and GST activity of the groups treated deltamethrin simultaneously with the change in temperature were lower than the groups at 18 °C and 28 °C. This increase was also observed in the group treated deltamethrin at 23 ºC.