THE DRIED RED CRAB WASTE CONTAINED 27.5% PROTEIN, 13.8% CRUDE LIPID, AND 0.008% CAROTENOIDS OF WHICH 95% WAS IN SOME FORM OF ASTAXANTHIN. RAINBOW TROUT WERE FED DIETS CONSISTING OF 20% WHOLE CRAB WASTE OR A PIGMENT EXTRACT FROM CRAB WASTE ADSORBED ON A COMMERCIAL TROUT RATION. THE FISH FED THE PIGMENT EXTRACT CONTAINING 0.2 MG OF CAROTENOIDS/G DIET WERE HIGHLY PIGMENTED AFTER SEVEN WEEKS. THE FISH FED THE 20% CRAB MEAL CONTAINED A MUCH LOWER LEVEL OF ASTAXANTHIN IN THE SKIN AND FLESH THAN WOULD HAVE BEEN EXPECTED ON THE BASIS OF THE LEVEL OF DIETARY CAROTENOIDS. IT WAS CONCLUDED THAT RED CRAB WASTE COULD BE USED FOR THE PIGMENTATION OF TROUT.