“Copper, Zinc, Iron, Lead, Manganese, and Cadmium Concentrations in Two Cambeva Species from Iguaçu River Streams in Brazil Exceed Permitted Limits, Causing Ecological Concern, Especially for Cadmium”

https://pubmed.ncbi.nlm.nih.gov/38117368

This study found varying concentrations of copper, zinc, iron, lead, manganese, and cadmium in two species of Cambeva from different streams of the Iguaçu River in Brazil, with some concentrations exceeding permitted limits and causing ecological concern, especially for cadmium.