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Igarapé do Daracua, Rio Negro, Barcelos, Brazil

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Brazil, South America, South America

This time I want to show a small stream of the Rio Negro River – Igarape do Daracua near Barcelos, Brazil.

This place interests me a lot, that’s why I tried to recreate this biotope in the aquarium, so my experience can help other aquarists.

My biotope contains wood, twigs and lots of dry leaves. And for the fish I only used Paracheirodon innesi and Petitella bleheri. There are actually many small fish living there, but as my tank measures only 100x40x40cm, I decided to use two species that live in groups – I don’t want this tank to be overpopulated.

I do not use aquatic plants, because in the original biotope there are none at all, except for the vegetation that grows from the seeds of the surrounding trees.

Submitted by
MAA Rafsanjani
Approved by
Roberto E. Reis, Pablo C. Lehmann and Flávio Lima
GPS
-0.4899390, -63.2024994
Geographical region
South America
Drainage Basin
Rio Amazonas
River catchment
Rio Negro
Water body type
Igarapè
Water body name
do Daracua
Water body part
River mouth
Water body course
Lower course
Water body: tributary of
Rio
Tributary name
Rio Negro

Videos above and below water

Water Chemistry

Water information

Water type
Fresh water
Water color
Black water
Water transparency
Medium
Concentration of sediments
Medium
Water temperature
25-27 °C
Water flow/curent
Slow

Chemical parameters

pH
4
Conductivity
8
GH
71 mg/l
KH
89 mg/l
Dissolved Oxygen
0.0002 %

Substrate in nature

Sand
Beige
Pebble/Gravel
Beige
Stone
Mixed
Stone form
Roundish
Silt/Mud
Reddish
Leaves
Adundant
Driftwood
Many
Submerged terrestrial vegetation
Yes

Aquatic Biotope

Date of collecting
05/February/2023
Collecting area
Backwaters
Water depth
0,2m
Air temperature
24 °C
Sunlight
Filtered/dappled sun

Environment

Environment
Affected by human activity
Affected by human activity
Agriculture
Agriculture
Advanced
Surrounding area

Igarapé do Daracua near Barcelos, central Rio Negro is a municipality named for the village of Daracua in the state of Amazonas, Brazil.

The area around the Rio Negro offers an extraordinary mix of natural beauty, cultural heritage and biodiversity. It is the ideal destination for those seeking an immersive experience in the Amazon rainforest and a deeper understanding of the area’s rich ecosystem and indigenous culture.

Underwater landscape

This biotope area is known for its dark, almost black water color, which is caused by the concentration of dissolved organic matter. This gave the river its name, Rio Negro, which means “Black River” in Portuguese. Dark waters create a different visual experience underwater, with less visibility compared to clearer rivers.

Igarapé and its underwater landscapes are home to an extraordinary diversity of aquatic biodiversity. The river supports a wide variety of fish species, including iconic species such as Paracheirodon innesi dan Petitella bleheri.

Fishes:

  • Paracheirodon innesi (Characidae)
  • Petitella bleheri (Characidae)
Threats to ecology

Industrial activities, agricultural runoff, and human settlements contribute to pollution in the Amazon River. Chemical pollutants, including pesticides and fertilizers, find their way into the water, posing a threat to aquatic ecosystems and the species that inhabit them.

Efforts are being made by governments, conservation organizations, and local communities to address these threats and protect the ecology of the Amazon River.

Conservation initiatives, sustainable land-use practices, stricter enforcement of environmental regulations, and the involvement of local communities in conservation efforts are crucial in mitigating these threats and preserving this unique and important ecosystem.