Composition of the organic fraction of Isochrysis aff. galbana clone T-ISO cultured semi-continuously with different renewal rates (left) and Brachionus plicatilis enriched for 24 h with the same microalgal cultures (right), expressed as pg · cell− 1 and ng · rotifer− 1 respectively. Crosshatched bars, protein; hatched bars, lipid; open bars, carbohydrate; –○–, C:N ratio. C: rotifer control sample, harvested before the start of the enrichment.