[ORGANIZATION]
Hoogheemraadschap De Stichtse Rijnlanden
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Situations
Invasive crayfish spread in Europe
2 clusters · 7 sources · last updated
Latest: Crayfish Conservation in England and Invasive Species Alert in the Netherlands
In late July 2026, Dutch authorities confirmed the detection of a ninth invasive river‑crayfish species, the calicotrivierkreeft, through e‑DNA testing, prompting a government‑led working group to assess control measures