Abstract
1. 1. Absorption and deposition of krill astaxanthin diester and synthesized free astaxanthin supplemented to diets were investigated by feeding juvenile coho salmon in freshwater. 2. 2. The astaxanthin diester was hydrolyzed in the intestine before being absorbed. No isomerization of astaxanthin was observed during hydrolysis. 3. 3. Astaxanthin was found in the serum for 6 days and then deposited in the flesh. Eight milligrams of astaxanthin equivalent per 100 g diet pigmented the flesh well in 6 weeks. 4. 4. There was practically no difference between krill astaxanthin diester and synthesized free astaxanthin in their absorption and deposition by coho salmon.
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