Effects of Water Temperature on Catalase Activity and Malondialdehyde Level in Muscle, Mouth, and Intestine Tissues of Doctor Fish (Garra rufa)

In this study, the catalase (CAT) activities and malondialdehyde (MDA) levels of some tissues (muscle, mouth and intestine) of Garra rufa (doctor fish) fed in different water temperatures (18°C and 34°C) were studied. No fish death was observed during the experiments. Despite the different significance levels, the proportional length increase, the proportional weight increase, food conversion efficiency of doctor fishes fed at 34°C were found to be lower than in fishes fed at 18°C. This can be due to the fact that doctor fishes living in a water temperature of 34°C have a higher metabolism, are more motile, and are more ready to the therapy. The CAT activities and the MDA levels of the tissues studied were found to be significantly different. The highest CAT activities and MDA levels were observed in intestine tissues. But the CAT activities and the MDA levels of the tissues studied for the fishes fed in 34°C water temperature were not significantly different from those of fishes fed in 18°C water temperature