(a) Protein content expressed in mg per 100 g of fresh weight (mg/100 g FW) and (b) antioxidant activity expressed in nmol TE per gram of fresh weight (nmol TE/g FW) in differently treated samples of R. pulmo jellyfish. JF-DW, R. pulmo washed with drinking water; Ca-Lactate JF-DW and Ca-Citrate JF-DW, JF samples treated with calcium lactate or calcium citrate brines for 5 days, respectively; Salt-Alum JF-DW, samples of R. pulmo JF-DW treated with salt and alum following the traditional method; Salt-alum Jp, commercial ready-to-eat sample of JF produced in Japan by a traditional alum-based method. Values are the means of three independent measurements ± standard deviation. ANOVA statistical test followed by Dunnett’s multiple comparison post hoc test were used to compare each treatment with the control (* p < 0.05 and *** p < 0.001).