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Middle Rio Negro, Amazonas, Brazil

Sponsored by

Brazil, Amazonas, Barcelos

This 86L aquarium boasts species of fish found thriving here among the maze of roots and downed branches in the shallows of a tiny section of flooded woodland not far from the city of Barcelos. The Cardinal tetra (Paracheirodon axelrodi), perhaps the most well-known of these, takes centre stage for the majority of this movie, its unmistakable neon blues and reds strikingly contrasted with the tea-colored water.

Igarapé do Daracua’s setting is typical of a variety of shallow, blackwater habitats that can be found throughout the Amazon and its tributaries, particularly the Rio Negro in Brazil and the Orinoco in Colombia and Venezuela. The water is warm at 30°C, very acidic (pH 6.0 in this aquarium), and completely devoid of minerals.

Additionally, the water contains a sizable amount of particulate organic matter, which many fish and invertebrates use as food.

Submitted by
Debojyoti Mondal
Approved by
Roberto E. Reis, Pablo C. Lehmann and Flávio Lima
Geographical region
South America
Drainage Basin
Rio Negro
River catchment
Water body type
River
Water body name
Rio Negro
Water body part
Water body course
Water body: tributary of
Rio
Tributary name
Amazonas

Water Chemistry

Water information

Water type
Fresh water
Water color
Black water
Water transparency
Medium
Concentration of sediments
Medium
Water temperature
30 °C
Water flow/curent
Slow

Chemical parameters

pH
6.5
Conductivity
GH
KH
3 mg/l
Dissolved Oxygen

Substrate in nature

Sand
Beige
Pebble/Gravel
Beige
Stone
None
Stone form
Silt/Mud
Brown
Leaves
Adundant
Driftwood
Many
Submerged terrestrial vegetation

Aquatic Biotope

Date of collecting
Collecting area
Shore line
Water depth
0,5m
Air temperature
Sunlight
Full sun

Environment

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

This 86L aquarium boasts species of fish found thriving here among the maze of roots and downed branches in the shallows of a tiny section of flooded woodland not far from the city of Barcelos. The Cardinal tetra (Paracheirodon axelrodi), perhaps the most well-known of these, takes centre stage for the majority of this movie, its unmistakable neon blues and reds strikingly contrasted with the tea-colored water.

Igarapé do Daracua’s setting is typical of a variety of shallow, blackwater habitats that can be found throughout the Amazon and its tributaries, particularly the Rio Negro in Brazil and the Orinoco in Colombia and Venezuela. The water is warm at 30°C, very acidic (pH 6.0 in this aquarium), and completely devoid of minerals.

Additionally, the water contains a sizable amount of particulate organic matter, which many fish and invertebrates use as food.

Threats to ecology

Comment by the expert

Roberto E. Reis: Description of the location weak, with no relevant mentions to the surroundings. No description of threats. No photos of the biotope except frames from a YouTube video. No biotope inhabitants listed, fish, plants or invertebrates. Description of the aquatic habitat, riparian zone, and underwater landscape weak. Bibliography/Sitography very weak.

Flávio Lima: The biotope recreated by the participant can be considered a faithful reproduction to a type of habitat found at the middle Rio Negro. The biotope would have benefitted in having 2-3 additional species typical from that area.

Pablo C. Lehmann: No video of the natural biotope was provided.