Abstract:
PROBLEM TO BE SOLVED: To inhibit the expansion of the diameter of a discharge hole.SOLUTION: The provided discharge unit comprises: an AC-type high voltage generation unit (33); paired electrodes (31, 32) configured within water so as to impress thereon a voltage from the high voltage generation unit (33); and an insulating partition plate (15) which partitions the gap of the paired electrodes (31, 32) within the water, on which a miniscule discharge hole (35) constituting a current path through the gap of the paired electrodes (31, 32) is formed, and which induces a discharge within the discharge hole (35) upon the impression of a voltage onto the paired electrodes (31, 32).
Abstract:
PROBLEM TO BE SOLVED: To provide a method for culturing fish and shellfish and a closed circulating culture system enabling a highly effective sterilization of pathogenic virus, a highly effective decomposition of ammonia and nitric acid ions, reduction of installing space, reduction of production cost and improvement of yield of the cultured fish and shellfish. SOLUTION: The method enables a highly effective and cost-reduced culture of the fish and shellfish in a culture system of from small to large scale by connecting an electrolyzing line 20 to a culturing tank 12, and automatically controlling the processing capacity of an AC electrolyzing equipment by controlling the inverter power supply 34 with a controller 30 responding to the electrical signals of a pH sensor 4 for culturing water, an ammonia sensor 26 and a nitric acid sensor 28.