Fig. 1From: Biochemical changes and drug residues in ascidian Halocynthia roretzi after formalin–hydrogen peroxide treatment regimen designed against soft tunic syndromeMortality of ascidians after combination treatment. Ascidians were exposed to formalin–H2O2, 4:1 ratio (ppm) 1 h a day for 7 days. Death was declared in the absence of visually observable siphon movement. N = 11 in each group. F formalin, H H2O2 Back to article page