[Features of the organization of the cytochrome systems and oxygen regimen in skeletal muscles of marine fishes].

The organization of cytochrome systems in pelagic (Mugil so-iuy) and benthic (Platichthys flesus luscus) species of sea fishes were investigated. The total cytochrome content was 3.6-3.7 times higher (p < 0.001) in muscles of active M. so-iuy and made 67.5 +/- 5.3 nM g-1 for red and 5.91 +/- 0.58 nM g-1 for white muscle tissue. Cytochrome stechiometry had non-compensation character in benthic P. flesus luscus. Cytochrome ratio-b/aa3, was less than one and was equivalent 0.80-0.83 for both muscle groups. On the contrary it was higher than one--1.47-1.66 (p < 0.001) in M. so-iuy. Differences in cytochrome organization were connected with oxygen state of muscle tissue of these fishes. Mean oxygen tension in P. flesus luscus muscles was lower for 20.1-22.5% (p < 0.001). A number of anoxic and hypoxic zones (less than 6 mm Hg) in muscle tissue of this fish made 70 and 4-6% for white and red muscles accordingly. This value was 1.7-2.5 times lower in M. so-iuy muscles.