Gut and gonad content for (a) total carotenoids (mg 100g-1 WW); (b) β-carotene (nmol mg-1 WW); and (c) echinenone (nmol mg-1 WW) for Loxechinus albus fed on 3 experimental diets and the field control. Data are showed as means ± S.D. of 5 independent replicates.