Vulnerable· population decreasing· assessed 2010

European Crayfish

Astacus astacus

Sighting evidence at Hranice Abyss, Hranice Abyss

Photo: michalzgierz1989 · CC BY-NC

Evidence at this site

2 records within 25 km

Confidence: low

Last confirmed Sep 2025

Seasonality

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

How is this calculated?

Sighting evidence is compiled from iNaturalist observation records within a set proximity radius, filtered for quality-grade observations. “Last confirmed” is the date of the most recent research-grade record. Record count covers a rolling 24-month window. Confidence reflects record count, recency, and consistency of seasonal signal.