Effect of deprivation and re-feeding periods on growth, feed utilization and carcass composition in iridescent shark, Pangasius sutchi

Deprivation and re-feeding periods have a special relationship with possible mechanism of compensatory growth and reduce the cost of feeding fish. The present study investigated different parameters such as feed efficiency, growth and body composition changes in order to compensate for the possible mechanism of growth retardation in Pangasius sutchi fry (with an average weight of 1.27 g ± 0.24). The survey was conducted for 60 days in Ghom, Iran. In this experiment a control group (no period of food deprivation) and treatments with alternating cycles of one day of fasting and 4-day feeding (treatment 1), 3 days of starvation and 12-day feeding (treatment 2), 6 days of starvation and 24-day feeding (treatment 3). Bioassays were repeated every 30 days. At the end of the experimental period, Specific growth ratio (SGR) and protein efficiency ratio (PER) of the experimental period, in the treatments of food deprivation compared to the control group improved (PPangasius sutchi fry, has the ability to withstand food deprivation and compensatory growth retardation at 6 days of starvation and leading to improved carcass fat