Table 2

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.

  Time Total Licensed Unlicensed Unlicensed

Inside area Outside area
Experimental introductions 1967–1988 63 61 2
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
  Total 872 484 388 283 103

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