3.9. DSC thermograms DSC thermogram of collagens from the skin of catla and rohu is pre- sented in Fig. 8. Endothermic peaks with Tmax of collagens from the skin of two carps varied in the range of 30.69-35.19 °C. Comparatively, sim- ilar Tmax suggested that all four collagens quite preserved in the helical secondary structure to a higher degree. The AH of ASC was slightly greater than that of PSC for both catla and rohu (Fig. . The results of DSC are in agreement with previous reports on the collagens from the carps (Liu et al., 2014; Pati et al., 2010). The thermal stability of collagen mainly depends on its imino acid content and also correlated with the body temperatures of fish species and their habitat temperatures (Matmaroh et al., 2011; Minh Thuy et al., 2014; Pati et al., 2010).