HADH and hydrops fetalis: In this aspect, the results of this study, in terms of gene expression of the mitochondrial β-oxidation markers (cpt1a and hadh), did not reveal a parallel increase with that of acox1 in the muscle of HF+HT_ST fish, suggesting incomplete oxidation of fatty acids and their subsequent accumulation, in agreement with the higher percentage of fat content obtained by the proximate analysis in that group.