Abstract
It is possible to differenciate farmed brook trout (20-23 cm) from wild ones by the incorpora tion of /3-apo-8'-car otenoic acid ethyl ester (CAEE) in the diet. In contrast with canthaxanthin this synthetic carotenoid is absent from wild trout flesh. After 4 and 6-week feeding periods with a meal containing 100 fjg of CAEE/g, most trout of marketable size (150 g and more) show small, but significant muscular CAEE concentration. Moreover there is no difference in flesh coloration bet ween experimentally marked trout and controls. This inexpensive marker could be used to prevent a possible increase of poaching on wild
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