Characidium grajahuense
Overview
A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.
Characidium grajahuense faces severe threats from deforestation and agricultural expansion in its restricted range within the Grajaú River basin of Maranhão, Brazil. The species' extremely limited distribution makes it particularly vulnerable to habitat degradation from cattle ranching and soybean cultivation, which have accelerated in the Cerrado-Amazon transition zone. Water quality deterioration from agricultural runoff and potential dam construction pose additional risks to this endemic freshwater fish.
Habitat
This endemic characin inhabits clear, shallow streams and tributaries within the Grajaú River system in Maranhão state, Brazil. The species is found in well-oxygenated waters with sandy or rocky substrates in areas of Cerrado savanna transitioning to Amazon rainforest.