They have always lived there, but only now have been discovered. The irony is that studies for the construction work which are threatening them made possible the discovery.
Meet the new catfish of Pará flows
El Diario: Fishes were the most affected by dams construction
June 29, 2014
The construction of dams in the Brazilian Amazon affected significantly the fauna of the rivers by the disappearance of fish species.
Fishing communities to be displaced by dams want a say in their future
April 24, 2015
Tapajos river fishers may join the group of Brazilians who need public assistance to feed themselves. The federal government has started a series of infrastructure projects that will take the fish away from the fishermen.
The giant Amazonian catfish threatened by energy demand
May 13, 2015
A new study suggests that the catfish’s sensitive life cycle—complete with long journeys timed to coincide with seasonal river flows—may be interrupted by dams in their last remaining refuge.