Quantitative Changes of Glycogen and Lactate in Muscle, Blood and Liver Tissues of Oreochromis Mossambicus under Hypoxia and Recovery
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چکیده
The anaerobic metabolism and its link with lactate and glycogen/glucose levels of muscles, liver and blood were quantitatively analyzed in tilapia, O. mossambicus under four different oxygen concentrations 5.20 + 0.65 (control), 3.66 + 0.55, 2.53 + 0.69 and 1.58 + 0.41 and recovery after 2 hrs (3.78 + 0.46) . The glycogen levels of muscle and liver reduced drastically at the oxygen level of 3.66 +0.55 mg/l and reduced further towards the exposure of fish to hypoxic condition at the oxygen level of 1.58 + 0.41 mg/l. However, the muscle and blood lactate showed a reverse trend to the glycogen levels. The total glycogen utilization at the oxygen level of 3.66 mg/l was 1000.3 mg/kg/hr (5.01 m.mol/hr), while at the oxygen concentration of 2.53 and 1.58 mg/l it was 323.1 mg/kg/hr (1.61 m.mols / hr) and 184.85 mg/ kg/hr (0.925 m.mols/hr) respectively. Out of the total glycogen utilized by the fish, about 14.77, 17.70 and 26.81% of glycogen was utilized for lactate production at the oxygen concentration of 3.66, 2.53 and 1.58 mg/l. Hence, only a meager percentage (14.7 – 26.8%) of glycogen utilization has been accounted for the production of lactate. The remaining amount of over 75% has supposed to be utilized for oxidation or for the production of end products other than lactate.
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