However, no change in visual colour score or carotenoid content was observed on raw fillets stored during three months at )20 C for fish fed astaxanthin, whereas a decrease of carotenoid content and visual scores was found for salmon fed with canthaxanthin (Sheehanet al., 1998).
In the present study, the effect of freezing on carotenoid concentration of raw muscle appears
difficult to explain, the lowest concentrations of astaxanthin being observed after two months of storage but the variation between storage time was small.