Abstract
1. 1. The tissue distributions and developmental progressions of glucose-6-phosphate dehydrogenase (GPD) and phosphogluconate dehydrogenase (PGD) in Brachydanio rerio (zebra danio) and B. albolineatus (pearl danio) are reported. 2. 2. The five GPD isozymes separated from adult and embryonic tissues consisted of two electrophoretically distinct components: a hexose-6-phosphate dehydrogenase (HPD) and a glacose-6-phosphate specific GPD. 3. 3. HPD isozymes were expressed continuously throughout development. 4. 4. Phosphogluconate dehydrogenase existed as a single form in all tissues and was continuously expressed in embryos. 5. 5. Spectrophotometric analyses of GPD and PGD profiles showed that activities of both enzymes were high between fertilization and blastulation and prior to hatching at 4 days.
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