Rio Negro near Barcelos, Brazil

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Brazil, Amazonas, Barcelos

In this 144L aquarium, I simulated the Negro River, the dry river bank before the rainy season. When the rainy season comes, the water level rises, flooding the plants on the banks of the river. This is the habitat of Carnegiella strigata, Paracheirodon axelrodi, Petitella bleheri, Nannostomus beckfordi, Prionobrama filigera. The bottom bed of aquarium is rich in humus and dead leaves, and fish can freely shuttle in the water.

Submitted by
Wang Qiliang
Approved by
Roberto E. Reis & Flávio Lima
-0.1415000, -63.1858826
Geographical region
South America
Drainage Basin
Amazon basin
River catchment
Rio Negro
Water body type
Water body name
Rio Negro
Water body part
Marsh land
Water body course
Middle course
Water body: tributary of
Tributary name
Rio Negro

Videos above and below water

Water Chemistry

Water information

Water type
Fresh water
Water color
Mixed water
Water transparency
Concentration of sediments
Water temperature
27 °C
Water flow/curent

Chemical parameters

5.0 mg/l
Dissolved Oxygen

Substrate in nature

Stone form
Submerged terrestrial vegetation

Aquatic Biotope

Date of collecting
Collecting area
River bank
Water depth
Air temperature
30 °C
Full sun


Surrounding area

The Rio Negro, is the largest tributary of the north bank of the Rio Amazon. Its source is the Rio Orinoco and the Rio Amazon watershed, it and Rio Orinoco between the casikiare river. The total length of the Rio Negrois 2550-2252.6km, the drainage area is 620000 km2, the annual average flow is 30000 /sec., the average annual runoff depth is 1600mm, and the suspended load concentration is 0.007 kg/.

The largest tributary of the lower reaches of the Rio Negro is Rio Branco. The middle and lower tributaries include the Rio Mucajai, Rio Ajarani, Rio Anaua and Rio Catrimani. It flows into the Amazon River 17 kilometers below Manaus. It is about 2000 kilometers long. The river course twists and turns. There are many sandbanks in the lower reaches. The river is 30-50 km wide, like a long lake. Below Taprukuala it is navigable.

Through the Rio Negro and the Rio Casiqyare, the Rio Amazon and Rio Orinoco are connected with each other. The basin is hot, rainy and sparsely populated. The marshes along the coast are humus. One of the small tributaries is Barcelos, located near Barcelona. It is located deep in the Amazon rainforest. It is covered with rain and needs to be rowed in by boat. A large amount of driftwood and fallen leaves (close to dense trees) are accumulated underwater, and some soil flows into the river at random.

Underwater landscape

In the rainy season of this tributary, the water level rose a lot, and a large amount of river water flooded the trees and weeds near the tributary, which also gave small fish more living space. There are many leaves in the tributary, and the increase of attachments makes small fish have more food.

Because of the existence of attachments, the river bottom is light yellow. A large amount of humus darkens the color of the water body. The part near the river bank is much clearer, while the whole tributary is slightly turbid.


  • Carnegiella strigata
  • Paracheirodon axelrodi
  • Petitella bleheri
  • Nannostomus beckfordi
  • Prionobrama filigera
Threats to ecology

Because this tributary can only be entered by boat, it has not been cut down and damaged. However, other areas are not so lucky, so I call on people to protect nature.

The Earth is not just human. As the ruler of the world, what we humans should do is not destroy, but protect. In all my fish tanks, there are often fish looking for mates, mating and breeding without human intervention. All I can do is give these interesting fish a home that belongs to them and is as comfortable as possible.