tions of the copepods Calanus helgolandicus and Acartia clausi, and noted increases in the ascorbic acid levels of 50% and 60%, respectively, for the animals. Their results supported the hypotheses that ascorbic acid from the microalgae can be incorporated with high efficiency through direct feeding. All the 11 species we examined, if ingested and digested, should provide an adequate supply of ascorbic acid to cultured animals at the next trophic level (e.g. fish larvae) of the mariculture food chain.
Microalgae also were rich in riboflavin. In a study of six species, we found concentrations during logarithmic growth-phase ranged from 20 p,g g-’ dry weight (Thalassiosira pseudonana) to 40 pg g-’ (Zsochrysis sp. (T.ISO)) (Fig. 5; Brown and Farmer, 1994). With the onset of stationary phase, the proportion of riboflavin increased