Open Access
Table 1
National crayfisheries strategies and management guidelines related to signal crayfish in Finland.
| Time | Aim | Area designed for P. leniusculus | Rationale for area selection | Conditions for P. leniusculus introductions | No. of P. leniusculus introduced with permit | |
|---|---|---|---|---|---|---|
| Experimental introductions | 1967–1988 | To test P. leniusculus suitability under Finnish conditions | 155 km2 | small and midle size lakes, rivers and brackish water inlets | No specific regulations | 86 400 |
| 1st strategy | 1989–2000 | Conservation of A. astacus; controlled spreading of P. leniusculus | 6200 km2 | Waters previous inhabited by A.astacus in southern Finland, spreading resctricted within natural catchments | No threat for A. astacus; material free of A.astaci; introduction needed always a permission | 1 511 500 |
| 2nd strategy | 2001–2013 | Conservation of A. astacus; controlled spreading of P. leniusculus | 7200 km2 | Area defined in the 1st management strategy further extended to cover established populations | No threat for A. astacus; material free of A.astaci; introduction needed always a permission | 570 700 |
| 3rd strategy | 2014–2016 | Conservation of A. astacus; controlled spreading of P. leniusculus | 19 700 km2 | Area defined in the 2nd management strategy further extended to cover established populations | No threat for A. astacus; material free of A.astaci; introduction needed always a permission, not given in catchments with only small lakes (<500 ha) | 35 900 |
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