Effects of potassium dichromate (K2Cr2O7) on skin ulcers upon the mantle tip of musky octopus (Eledone moschata) in controlled conditions were investigated. Therefore, the trials on five octopuses were performed at 0.1, 0.15 and 0.2 gL(-1) concentrations of potassium dichromate by bath method. The bath applications were carried out at 20.3 +/- 0.1 degrees C for 1 h day(-1) for two days consecutively. The following 10 days, the musky octopuses were observed for cicatrization or any mortality. In the control group, one individual died and it was observed of the skin lesion enlargement in the one individual and cicatrized of skin ulcers in the remainders, but did not like in the disinfected groups. At 0.1, 0.15 and 0.2 gL(-1) concentrations of potassium dichromate, cicatrization of skin ulcers upon mantle tip of the musky octopuses in controlled conditions was observed without any mortality.