Profile of Oxidoreductases Activity in the Cardiac and Skeletal Muscle Tissues of Adult and Juvenile Scorpaena porcus (Scorpaenidae)

The activity of oxidoreductases (MDH, 1.1.1.37; LDH, 1.1.1.27; and catalase, 1.11.1.6) has been studied in the white and red muscles, atrium, and ventricle of the myocardium of adult and juvenile Scorpaena porcus Linnaeus, 1758 as a species preadapted to hypoxia. Tissue and age differences in the magnitude and ratio of oxidoreductases activity is established. A similar value of MDH activity is found in the following tissue pairs: in the atrium and red muscles of adult, as well as in the atrium and white muscles, ventricle, and red muscles of juvenile scorpionfish. Catalase activity is associated with the physiological activity of skeletal muscle and increased with the age of the scorpionfish. The commonality of the energy metabolism pathways in the myocardium and skeletal muscles is determined by an age-dependent increase in the efficiency of the heart performance, which is associated with the initial “anaerobization” of the myocardium as a protective mechanism during O2 deficiency.