Abstract
1.1. The tissue specificity and ontogeny of supernatant malate dehydrogenase (s-MDH) and alcohol dehydrogenase (ADH) are reported for the tiger barb (Barbus tetrazona), the rosy barb (Barbus conchonius) and their reciprocal hybrids.2.2. The tissue distribution of s-MDH and ADH isozymes in both species is consistent with spatial profiles reported for other teleosts.3.3. The expression of alleles of paternal origin at the s-Mdh-B and Adhloci are delayed in reciprocal hybrids as compared to their expression intraspecifically; suggestive of a low degree of affinity between maternally derived regulatory factors and paternal regulative elements controlling structural gene activation.
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