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Igarapé Tucano, Rio Negro, Brazil
Brazil, Amazonas
This aquarium recreates a blackwater igarapé (small forest stream) from the Rio Negro basin in the Brazilian Amazon. These habitats are characterized by submerged tree roots, fallen branches, leaf litter, and tannin-stained water, which gives the environment its dark amber coloration. The Rio Negro is the world’s largest blackwater river and is renowned for its extremely soft, acidic water and remarkable biodiversity.
- Submitted by
- Luis Sequeira
- Approved by
- Roberto E. Reis, Pablo C. Lehmann & Antonio Machado-Allison
- GPS
- 0.1134720, -67.8332214
- Geographical region
- South America
- Drainage Basin
- Rio Amazonas
- River catchment
- Rio Negro
- Water body type
- Igarapè
- Water body name
- Tucano
- Water body part
- Pool
- Water body course
- Lower course
- Water body: tributary of
- Rio
- Tributary name
- Negro
Videos above and below water
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Water Chemistry
Water information
- Water type
- Freshwater
- Water color
- Black water
- Water transparency
- Medium
- Concentration of sediments
- High
- Water temperature
- 26 °C
- Water flow/curent
- Slow
Chemical parameters
- pH
- 6.0
- Conductivity
- 30
- GH
- 10 mg/l
- dGH
- KH
- 7 mg/l
- dKH
- Dissolved Oxygen
- 70 %
Substrate in nature
- Sand
- White
- Pebble/Gravel
- None
- Stone
- Grey
- Stone form
- Roundish
- Silt/Mud
- Beige
- Leaves
- Adundant
- Driftwood
- Many
- Submerged terrestrial vegetation
- None
Aquatic Biotope
- Date of collecting
- 11/13/2025
- Collecting area
- Small bay
- Water depth
- 1,0m
- Air temperature
- 28 °C
- Sunlight
- Partial shade
Environment
- Environment
- Untouched
- Surrounding area
The river is surrounded by dense tropical rainforest with abundant riparian vegetation. Large trees line the banks, creating a shaded environment and allowing only filtered sunlight to reach the water. Exposed roots, fallen branches, and leaf litter are common along the shoreline, contributing organic matter to the ecosystem. The watercourse flows slowly through the forest, providing shelter and breeding areas for many fish, invertebrates, birds, and other wildlife. This type of habitat is characteristic of Amazonian blackwater streams and igarapés.
- Underwater landscape
Below the water surface, the streambed is composed mainly of fine sand covered with leaf litter, small branches, and submerged wood. Fallen roots and tree limbs create a complex underwater structure that provides shelter, feeding grounds, and spawning sites for fish and invertebrates. The water is clear to tea-colored due to tannins released from decomposing organic matter. Aquatic vegetation is scarce, while the substrate and woody debris dominate the habitat, creating a typical Amazonian blackwater stream environment.
Fish:
- Paracheirodon axelrodi (Characidae)
- Threats to ecology
The main ecological threats are deforestation, mining, water pollution, climate change, and habitat degradation. These activities can alter water quality, reduce forest cover, and threaten the survival of native species adapted to blackwater habitats.
Riparian zone
- Trees near the aquatic habitat
-
Many -
