Abstract

The white-clawed crayfish Austropotamobius pallipes (Lereboullet) is becoming increasingly restricted to headwater streams elsewhere in Europe, but it is still widespread in lakes and rivers over much of Ireland. Currently, across most of its range population monitoring methods are usually based on stream hand-search techniques. In Ireland, there are significant stocks in large lakes for which monitoring methods have not been standardized. A number of experimental monitoring methods (hand search, hand netting, night search and trapping) were tested in a pilot survey of six contrasting lakes in the search for a standardized methodology. Hand search proved appropriate in most cases; trapping was recommended only when conditions were difficult.

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