Abstract

Finland was the leading crayfish exporter in Europe at the tum of the century when about 15.5 million crayfish were sent abroad. A few years later the trade declined sharply due to crayfish plague (Aphanomyces astaci). Crayfish diseases, especially plague, continue to be the greatest threat to the crayfish fishery. Crayfish diseases have spread over the entire range of the native noble crayfish (Astacus astacus) in Finland due to careless catching and stocking. Information on crayfish mortalities and disease outbreaks in natural waters, as well as in crayfish culture, is essential for preventing the spread of disease and when planning brood crayfish acquisition and stocking. The Finnish Game and Fisheries Research Institute has gathered information on crayfish mortalities and disease outbreaks since 1972. This information will be transferred to a computer data base register for rapid searches and processing. The significance and applicability of the mortality register to the control of crayfish diseases is discussed.

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