Introduced alien signal crayfish (Pacifastacus leniusculus) in Finland − uncontrollable expansion despite numerous crayfisheries strategies | Knowledge and Management of Aquatic Ecosystems

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Fig. 4

All recorded signal crayfish introductions (white circles), unlicensed observations inside signal crayfish region (orange circles, and unlicensed observations outside signal crayfish region (red circles) in Finland 1967–2016. Marked areas represent regions designated for signal crayfish in national crayfisheries strategies.

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