Abstract
Well pigmented flesh is regarded second after freshness as one of the most important quality criteria for farmed Atlantic salmon (Salmo salar). The required redness of salmonid flesh has caused a steady increase of astaxanthin concentration in salmonid flesh from about 2–3 mg kg−1 during the 1970s to above 6 mg kg−1 today. An individual variation in flesh pigmentation of more than 100% is experienced under practical as well as experimental conditions. An individual variation of this magnitude makes the precision of carotenoid estimations low, and impairs comparisons of treatments. The present paper discuss the importance of standardisation of the experimental conditions in relation to the level of flesh pigmentation and to variation in populations with the main focus on the effect of fish size, flesh carotenoid concentration and environmental factors.
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