One uses advantageously, as feed, feed component or feed additive a composition comprising an efficient amount of vitamin D metabolites or any source of same for improving or enhancing resorption of minerals, especially phosphor and calcium in farmed fishes and crustaceans. One further provides mean enabling a substantial reduction of phosphor pollution in aquaculture when feeding fishes and crustaceans by means of a dedicated feed having reduced phosphor content and supplemented in the same time with such a feed, feed component or feed additive.
