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Lactate dehydrogenase ec isozyme patterns during the development of milkfish chanos chanos

, : Lactate dehydrogenase ec isozyme patterns during the development of milkfish chanos chanos. Kalikasan 10(2-3): 289-299

Polyacrylamide disc gel electrophoresis was done to determine the lactate dehydrogenase (LDH) isozyme patterns for fry (5-3 mg), fingerling (6-12 g), pond-size (150-250 g) and adult (6-9 kg) milkfish. The patterns were tissue specific; the different tissues examined, i.e., eye, liver, heart and skeletal muscle, had different expressions of LDH isozymes. The resolved patterns appeared to be products of LDH gene loci A, B and C. Subunits A and B were present in all tissues. A4 and B4 were predominant in skeletal and heart muscle, respectively; the 2 associated nonrandomly in vivo and formed only the heteropolymers A3B and AB3. A liver band, L4, was most conspicuous in the fingerling, pond-size and adult; it was assumed to be coded by locus C. A negatively charged band, X4, was detected in fully developed ovary and in fry homogenized as whole individuals, but it could not be resolved in tissues of fingerling. Stunts (6-mo-old) and 3-mo.-old fingerlings had similar LDH patterns for all tissues examined. The patterns for 11-mo.-old stunts and fingerlings also were similar but the one for the eye of the former was the same pattern resolved for the eye of adults. There was no change in the LDH isozyme patterns of milkfish stunted for 6 mo. under different salinity levels (0-5, 15-20, 32-35 ppt [parts per thousand]).


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