Community Research and Development Information Service - CORDIS

Nutritional control of skin colour

This study clearly showed that:
- Colour reversibility in wild and cultured red porgies from red to dark skin and the opposite as a consequence of dietary carotenoid ingestion take about 100 days, although some colour changes can be observed after only 50 days of feeding.

- Diesther astaxanthin contained in natural ingredients when used in formula feeds for the red porgy give closer fish skin coloration to that of the wild fish.

- Krill meal either hydrolyzed or not, is a good source of carotenoids for the red porgy, resulting in increased redness and yellowness but not skin lightness. Inclusion levels under 30% are highly enough to obtain a skin colour similar to that of the wild specimens.

- Shrimp waste meal because of its high availability and cheaper price is a good alternative to be included in diets for the red porgy. Inclusion levels of shrimp waste meal, which represents up to 40mg astaxanthin per Kg diet are high enough to obtain a skin colour of the fish closer to that of the wild ones.

- Although canthaxanthin is absorved by the red porgy its not produce any colour improvement in fish skin when is included in the diet up to 100mg/Kg diet.

- Colour appearance similar to that of the wild fish can be achieved by feeding the adequate formula feed between 2 to 3 months before harvesting of the fish.

- Body composition is affected by dietary carotenoid addition, being this effect different for the different carotenoid sources used in the formula feed.

Reported by

Instituto Canario de Ciencias Marinas
Apartado de Correos, 56, Muelle de Taliarte s/n
35200 Telde
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