INCREASING CYST YIELDS IN ARTEMIA CULTURE PONDS IN VIETNAM - THE MULTICYCLE SYSTEM

In this study, one-cycle and multi-cycle culture systems for Artemia i n seasonal salt ponds are compared. In one-cycle systems, Artemia is i noculated only once per season, while in multicycle systems ponds are drained and re-stocked several times per season. In Vietnam, three-cyc le systems gave significantly higher cyst yields than did the one-cycl e system. However, after two cycles, systems were not significantly di fferent. Food limitation probably caused the steady decline in cyst yi elds, as observed in the one-cycle ponds. In these ponds, females have smaller broods (from the second cycle onwards) and during the last cy cle the number of adult females is lower than in multi-cycle ponds.