Invasive red crayfish recorded for first time in Amazon biome

Researchers have documented the first occurrence of the invasive red crayfish, Procambarus clarkii, within the Amazon biome. Two females were discovered in August 2018 at Cruzeiro Beach in the Icoaraci district of Belém, located along the Maguari River.

The specimens, measuring between 12.6 and 13.4 centimeters, were preserved and deposited in the Carcinological Collection of the Crustacean Laboratory at the Federal Rural University of the Amazon (UFRA). The findings were detailed in a study published in the scientific journal Nauplius by researchers from the Federal University of Pará (UFPA) and UFRA.

Native to North America, specifically the southern United States and northeastern Mexico, Procambarus clarkii has become one of the most widespread invasive crayfish species globally. While previously recorded in Brazil's South and Southeast regions, this discovery marks its expansion into the Amazon. Scientists suggest that the aquarium trade may be a primary route for such introductions and have called for increased monitoring and research.