Abstract

1. 1. Activities of δ-aminolevulinic acid synthetase (ALA-S) and δ-aminolevulinic acid dehydratase (ALA-D) in trout liver and kidney were compared with those in the mouse. 2. 2. ALA-S activity (per unit tissue fresh weight) exceeded ALA-D activity in trout liver and kidney. 3. 3. In trout kidney, ALA-S activity slightly exceeded, and ALA-D activity far exceeded, their activities in trout liver. 4. 4. In trout, heme synthesis differs from that in mammals in that appreciable synthesis occurs in the kidney, and in that ALA-S activity in not rate limiting.

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