He realised he had taken a wrong turn and was trying to make his way back upstream when he encountered a fast current.

The river flows about 370 km, dropping over 1200 m over its course, with large volume rapids, fast current, and six canyons.

This species was found in deforested areas in moderate to fast current streams.

Periphyton are typically filamentous and tufted algae that can attach themselves to objects to avoid being washed away by fast current.

Because of its relatively fast current, it was used to clean skins, and rinse chemicals from the processed product.