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The effects of glycopeptides, prepared from pearl oyster Pinctada fucata, on embryonic development, larval and juvenile growth and adult non-specific immunity of P. fucata were investigated in this study. Glycopeptides had a pronounced stimulatory effect on embryonic development and larval and juvenile growth of P. fucata. enhancing with increased glycopeptide concentrations. All of haemocytes, phagocytosis, aggregation, serum microbiostatic activity and bacteriocidal activity all showed significant increases after 60-day feeding, relative to unfed controls. The major conclusion is that glycopeptides had a pronounced stimulatory effect on the non-specific immunity of pearl oysters. [ABSTRACT FROM AUTHOR]