The number of waters with licenced signal crayfish introductions and unlicensed observations in Finland according to national crayfisheries strategies. Unlicensed observations are further divided to two categories on the basis of whether they were located inside or outside the region designed for signal crayfish.
|Inside area||Outside area|
|1st crayfisheries strategy||1989–2000||413||343||70||50||20|
|2nd crayfisheries strategy||2001–2013||360||78||282||203||79|
|3rd crayfisheries strategy||2014–2016||36||2||34||30||4|
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