[Aminotransferase activity in the development of the white amur Ctenopharingodon idella]

Thermal and pH optima have been established for alanine and aspartate aminotransferases from mature eggs, ovarial and perivitelline fluids of the fish. The range of the values of pH of the ovarial fluid is such that the activity of the aminotransferases investigated is equal practically to zero. At the same time, pH of the perivitelline fluid is optimal for the activity of these enzymes. During embryogenesis of the fish the activity of both aminotransferases increases. It is suggested that the increase in transamination of alanine is more significant than that of aspartic acid.