The present study determines the kinetic and thermodynamic parameters of the degradation process of the biodiesel produced from fish viscera oil. The analyses were performed through the accelerated trials of oxidation of biodiesel (EN 14112) at different temperatures (100, 105, 110, 115, 120 e 125 degrees C). Through the analyses of the results of the induction period, the reaction was considered to be of the first order. It was determined by the rate constants (IQ varying from 0.0868 to 0.42271 h(-1), activation energy (Ea) of 81.99 kJ.mol(-1), the pre-exponential factor (A) of 2.61 x 10(10) h(-1), enthalpy of activation (Delta H-not equal) of 78.79 kJ. mol(-1), entropy of activation (Delta S-not equal) 55.94 J . k(-1). mol(-1) and Gibb's free energy of activation (Delta G(not equal)) average of 10025 kj.mol(-1). The results showed that biodiesel oxidation reaction is non-spontaneous (Delta G(not equal) > 0), endothermic (Delta H-not equal> 0), and that the temperature and the oxidation concentration influences significantly the degradation process of methyl esters. (C) 2017 Elsevier B.V. All rights reserved.