Fig. 4From: Biochemical changes and drug residues in ascidian Halocynthia roretzi after formalin–hydrogen peroxide treatment regimen designed against soft tunic syndromeFormalin and H2O2 concentration in treatment bath and treated edible ascidian tissues. Formalin and H2O2 concentrations were measured at the termination of 1 h exposure in the treatment bath and ascidians. Additional measurements were made at 4, 24, or 48 h. a Formalin concentration; b H2O2 concentration; N = 3Back to article page