Physiological responses to hypothermal stress of Tra catfish (Pangasianodon hypophthalmus) subjected to different feeding rates

One of the most vulnerable impacts of climate on aquaculture is abnormally low temperature. The present study aimed to evaluate the effects of different feeding rates on physiological responses of Tra catfish (Pangasianodon hypophthalmus) exposed to hypothermal stress. The experimental diets were fed to triplicate groups of fish (initial weight of 6.77 g) with four feeding rates (2%, 3%, 4% and 6% of wet body weight) in a recirculation system for 4 weeks. After the feeding trial, rearing water temperature was lowered from 30 ℃ to 23 ℃ and maintained at 23 ℃ for 24 h. Fish fed 6% diet exhibited higher (p