Abstract In the present study, biochemical composition of some Echinodermata (Holothuroidea, Echinoidea) from Red Sea, Egypt was investigated. The results showed that highest percentage saturated fatty acids (SFA) in Holothuria nobilis and lowest recorded scabra. monounsaturated (MUFA) Pearsonothuria graeffei while atra. polyunsaturated (PUFA) omega-3 Stichopus hermanni however, Diadema setosum...