Collagen was extracted from backbone of common dolphinfish using acidic and ultrasound methods. Then, different properties of extracted collagens including proximate composition, amino acid profile, viscosity, FT-R spectra, DSC, color, antioxidan activity, mulsifying and foaming properties were evaluated. Extraction yield of collagen from common dolphinfish bone using ultrasound (2.19%) was higher acidic method (1.34%). Collagen extracted using ultrasound method (81.60%) contained higher amounts of protein than that isolated using acidic method (77.74%). However, fat (0.95%) and ash (1.50%) contents were higher in collagen extracted using acidic method. Amino acid profile of extracted collagens was similar however, total amino acids, proline and hydroxyproline (the main indicator of collagen) contents was highest in the collagen extracted using ultrasound method. Similar FT-IR spectra and DSC analysis was recorded for both collagens. Colorimetric results showed that the extracted collagens did not differ significantly in color. The DPPH radical scavenging activity of extracted collagens was ranged from 29.10 to 42.17%. Herein, collagens extracted using ultrasound method had higher DPPH radical scavenging and reducing power activities than those extracted using acidic method, at all used concentrations. As well, the extracted collagens showed different iron-reducing powers. The values of emulsifying capacity and emulsion stability of collagens, regardless of their type, were measured as 16.89-31.67% and 15.21-28.41%, respectively. The foaming capacity and foam stability values of extracted collagens were measured as 68.97-97.41% and 64.21-88.95%, respectively. Herein, ultrasound-extracted collagen had higher emulsifying and foaming properties than those extracted using acidic method, at all used concentrations.