Rio Ucayali

Driftwood in Rio Ucayali in the end of rainy season.

A pair of the Ucayali blackline catfish Pimelodella hartwelli caught where the Rio Ucayali meets Rio Pacaya.

I guess it's fish for dinner. Rio Ucayali is rich in fish species and even during rainy season itś easy to fill up the canoe.

Changing water levels creates ideal conditions for floating plants like water hyacinth Eichhornia crassipes, water lettuce Pistia stratiotes, Mimosa amphibium, water spangles Salvinia minima and water grass Hygroryza aristata.


 The peruvian blue sole Apionichthys nattereriThis rare fish was caught in Rio Ucayali near the village of Bretaña.

This festive amazon parrot Amazona festiva was kept as a pet by a family in the small village Bretaña.

Rio Pacaya

Rio Pacaya in Pacaya Samiria is an unspoiled jewel of the Amazon. Dense impenetrable rainforest makes the rivers the only way to travel to this amazing place.

 I caught this serated silver catfish (Auchenipterus ambyiacus) in Rio Pacaya. The water was very cloudy in this slow moving part of the river.

This South American freshwater stingray Potamotrygon motoro is the most common in the region. Only adults have the ocellated rings. 

Rio Pacaya is a blackwater river which run in to the Pacaya Samiria.

The giant talking catfish Megalodoras uranoscopus is also present here. Juveniles like this one have amazing contrast in coloration.

Young Redtail catfish Phractocephalus hemioliopterus are beautiful. The yellow and red coloration is incrediable. 

During rainy season the rivers floods the forest and the rainforest floor becomes habitat for thousands of fish species.

This Oscar cichlid Astronotus ocellatus was caught in the flooded forest in shallow waters. The individuals we found in this area all had ocellated rings (5-7) high up in the dorsal fin. 

Young Firewood catfish Sorubimichthys planiceps like this one I usually found in the shallow waters amoung the floating plants.

Pimelodid catfishes (among others) dying in the Rio Pacaya in Pacaya Samiria. Skimming the surface for oxygen. The rainy season starts and releases toxic gasses from the mud bottom.

All fish are affected by these conditions. This South American freshwater stingray Potamotrygon motoro is also taking it's last breath.

Rio Nanay


Rio Nanay with floating islands of water hyacinth Eichhornia crassipes, water lettuce Pistia stratiotes and water grass Hygroryza aristata.

Great white egrets Ardea alba in great numbers over Rio Nanay.



A special thanks to: 

Brian Sidlauskas (Anostomidae)

Robson Tamar da Costa Ramos (Achiridae)

Dan Olsen (web support)

Claus Christensen (Aquatic plants)

Nikolai Filskov (Aves)


Best Regards Peter Petersen