A fermentation composition for treatment of aquatic environments. The fuel cell includes an oxidizer electrode surrounding member provided at four corners of the fuel cell unit to incorporate atmospheric oxygen through an oxidizer intake formed at a gap of the oxidizer electrode surrounding member. Also described is a sensing circuit for detecting current induced in a receiving electrode of an electric field sensing arrangement, wherein the sensing circuit employs two-phase charge accumulation. In this process, polyester is dissolved in the dicarboxylic acid dialkyl ester or a dicarboxylic acid dialkyl ester mixture and subsequently extracted from the solution by means of solid-liquid separation. Then, the control apparatus confirms a response to transmission of the command for instructing to end the prescribed operation, and retransmits, by unicast, the command to end the prescribed operation to each image capturing apparatus whose response is not confirmed. Further enhancement of the animal appearance may be had through etchings or engravings on the main blade body to represent other features of the animal.