In this paper the definitions of active substance, biocidal product and the categories and product types are presented. The principles of placing on the market of biocidal product in respects of Directive 98/8/EEC are discussed.
The most sensitive water parameter, and also the most difficult to monitor, is microbial contamination. This is not monitored with respect to the threat it poses to fish. The occurrence in fish environments of strains of pathogenic viruses, bacteria, fungi, and developmental forms of parasites are particularly dangerous. Any changes that adversely affect fish resistance and decreases it are also beneficial for the reproductive processes of saprophytic flora. The aim of disinfection as a prophylactic method and as a supplemental therapy for fish is to neutralize harmful vegetative microbial forms, particularly pathogenic ones, in the external environment at the beginning of rearing. This method of protecting fish health is of particular significance during intense rearing. Disinfectants that are currently recognized as effective include acidic preparations based on peracetic acid (CIP, Oxim, Steridial). These can be used to bathe eggs, larvae and fish during rearing. In addition to their effectiveness against viruses, bacteria, and fungi, they are also biodegradable and are safe for the environment.