Fig. 1

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A situation map of sites with recorded presence of Macrobrachium nipponense in Central Europe, and the red area in the Danube and Dniester River delta outlined with dashed lines, indicate the known occurrence of the M. nipponense to date (Surugiu, 2022; Bushuiev et al., 2023) − A. Detailed view of the monitored locality: Racklau Harbour in Passau, Germany, with depicted position of eel traps during two different time periods; Prawn pictograms indicate the area where the species was first detected in July 2023 – B, and Lipót region, Hungary, where M. nipponense was first spotted in August 2023 in Kövecses pond, and then found in January and July 2024 in artificial channel system and Lipót oxbow lake, respectively − C.

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