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Background: The present study reports the changes in the redox state and glucose activity in gills and muscles of Koi carps, exposed to a short duration of acute thermal stress. The variation in levels of lipid peroxidation (LPO) and glutathione (GSH), catalase (CAT) and glutathione-S-transferase (GST) activity, in addition to glucose levels, were analysed after exposing the fishes to 15°C (low), 25°C (control) and 35°C (high) for a duration of 3 and 6 h. The upper and lower temperatures regimes were decided by the Critical Thermal Limit (CT MAX and CT MIN). Results: The CAT activity was high in both the tissues at 35°C within 3 h, while LPO activity decreased throughout the study when compared with the control group indicating immoderate cellular disturbance and surplus oxidative stress. At 15°C (3 h), tissues reported more glucose compared with the upper thermal slab. GSH increased in both the tissues at 15°C compared with the control for 3 and 6 h. GST activity, however, flourished at 35°C in muscles and gills for the 3-h regime. Conclusion: The current study demonstrated disturbing impacts of temperature on the survivability of the Koi carps in a domesticated environment.

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An amendment to this paper has been published and can be accessed via the original article.

The impact of a 96-hour exposure period to pH grades on lipid peroxidation (LPO), catalase (CAT), reduced glutathione (GSH), glutathione-S-transferase (GST), and glucose activity in the muscles and gills of koi carp was investigated. Juveniles were exposed to pH grade from 4.0 to 10.0 for four days to observe variance in enzymatic activity. There was a strong correlation between oxidative stress and antioxidant defence activity as an evidential increase was noted in the CAT, GST, and GSH values. Glucose levels were elevated throughout the experimental conditions in both tissues. The fish exhibited a strong behavioral association with a gradual increase in pH grades. There were significant fluctuations in the pH grades with basicity having a greater impact than acidity on the tissues investigated.