Area Rasa em Rio Demeni, Amazonas Brasil

_th place in Biotope Aquarium Design Contest 2020

Volume: 31 L
Dimensions: 30×30×35 cm
List of fishes:

Paracheirodon axelrodi

Female paucisquasmis apistogram

Gephira Apistogram

List of plants: Weeds (Carex lupulina)
Description of decorations: Coconut powder to simulate the decaying bottom.
Similar to the biotope background.
Description of equipment: Filter 150 L / H
Bulb t8

Water parameters: The temperature in the aquarium is fixed at 29c with small changes that simulate the rainy periods or the cooler flows that flow. The Ph is 5.8 with 4gh and 2kh.
Additional info: Water changes made weekly
Between 15% water
With filter maintenance


Description of the area surrounding the biotope: The Demini River is originally from the Amazon rainforest in the state of Amazonas, Brazil and is part of the tributary system of the Negro River system. The Demini River rises in the Serra do Aracá State Park, a 1,818,700-hectare (4,494,000-acre) conservation unit created in 1990. It flows southwest through the park and then south to join the Rio Negro . The Toototobi River is a tributary of the upper Demini, near the headwaters of the Orinoco, close to the Venezuelan border. The Yanomami Indians are native to this area.

Description of the underwater landscape of the biotope: Further upstream, close to its connection with Xeruini and Araca, the river is rocky with rapids and waterfalls. Although in the lower region the habitat seems to be more simplistic.
Near the coast, under the roots of the acara-acu (psidium arboreum), it is home to several types of fish. The water flow is slow, in addition to the bottom being covered with litter, broken branches and fallen nuts from trees that were taken away from the current. The color of the water is quite weak (similar to a tea) (except in some times of the year when there is white water), especially in regions with slow flow. The roots of the trees and plants in the surrounding area are scattered in the water, providing safety to smaller fish and breeding sections. The fish appear near the canopy of trees and have all the food they want, terrestrial insects, fruits. and seeds. Some stones appear sparingly and fine sand covers the bottom.

Description of the parameters of the habitat: The parameters of the habitat are: water, usually tea-colored, with pH ranging from 5 to 5.5, water temperature from 29 to 32, conductivity of 4-6 μS / cm (maximum 20 μS / cm).

List of fishes and invertebrates occurring in the nature biotope: Symphysodon discus, Dicrossus filamentosus, Nannostomus eques, Heros efasciatus, Mesonauta festivus, Hemigrammus bleheri, Corydoras adolfoi

List of plants found in the nature biotope:

Eichhornia crassipes

Threats to the ecology: Dry and burned trees, devastated riverside forests, destroyed gardens, great fish mortality, are some of the damages caused by extensive forest fires in the Barcelos region. Community residents report the impacts of uncontrolled fire.

Sources of information:

Comments of the members of the jury of Biotope Aquarium Design Contest 2020