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The carotenoid composition of the fresh-water prawn, Macrobrachium rosembergii, was analyzed. Astaxanthin and its esters were found to be the prinary pignents in the fresh-water parwn, M. rosenbergii. A small amount of echinenone, isocryptoxanthin, α-and β-cryptoxanthin were also detected in the prawn fed an experimental diet. The deposition of carotenoid pimgment in the fresh-eater prawn with and without eyestalk ablation was examined. Prawn were fed diets contanining β-carotene or canthaxanthin at a level of 40mg/100g diet for three weeks. Astaxanthin and its esters were isolated as the dominant pigment in all groups. The prawn fed the pigmented diets appeared more pigmented. In the ablated groups, prawn fed the pigmented diets shoued a significant increase in carotennoid leveld over anlated controls. The finding of isocryptoxanthin and echinenone and the significant increase of astaxanthin and its esters in the ablated prawn fed β-carotene and acnthaxanthin could indicate that M. rosenbergii is capable of converting β-carotene into astaxaanthin via siocryptoxanthin, echinenone and canthaxanthin.

The influence of eyestalk ablation on the carotenoid composition of juvenile Macrobrachium rosenbergii.