Halda River сannal, Bangladesh

__st place in Biotope Aquarium Design Contest 2018

russia UAE. Rex L. Ribay

Volume: 112 L
Dimensions: 80x35x40 cm
List of fishes: Trichogaster chuna
List of plants: N/A
Description of decorations: Predominately black sand. There are some smaller grayish rocks covered w algae. Twigs and branches dominate this scenery, palm leaves at different forest leaves stages of decomposition to complete.
Description of equipment: Filter eheim suspends Liberty 75. ZETLIGHT LANCIA ZP 4000.
Water parameters: Water temperature should be maintained at around 22 to 28°C. With a pH of around 7.

INFORMATION ABOUT BIOTOPE

Description of the area surrounding the biotope: Halda River is a river in south-eastern Bangladesh.[1] It originates at the Badnatali Hill Ranges in Ramgarh Upazila in the Chittagong Hill Tracts, flows through Fatikchhari Upazila, Bhujpur Thana, Hathazari Upazila, Raozan Upazila and Chandgaon Thana of the Chittagong Metropolitan City, and falls into the Karnaphuli River.[2][3] The 81-kilometre (50 mi) long river has a very turbulent tributary, the Dhurung River, which joins Purba Dhalai about 48 kilometres (30 mi) downstream. The river is navigable by big boats 29 km into it (up to Nazir Hat) and by small boats 16–24 km further (up to Narayanhat). The Halda reaches up 21 feet (6.4 m) in depth and 30 feet (9.1 m) in deepest point.spilling over into adjoining croplands and eventually finding its way into the canal. tree leaves n decaying leaf palm leaves scattered around the area.

Description of the underwater landscape of the biotope: This specific biotope is a small creek in the halda river bank sand stone . It substrate consists predominantly of fine black sand, with some palm leaf forest leaves and organic matter. Few smaller rocks covered w/algae occur. This aquarium is dedicated to the densely forested area, hence many branches decaying leaves dominate this scenery.

Description of the parameters of the habitat: Water of this biotope is tea coloured and quite clear. The average temperature is 26°C, with only little variation due to the tropical climate and the overhanging forest. Water is typically soft and acidic. TDS 10-15 mg/l.

List of fishes and invertebrates occurring in the nature biotope: Trichogaster chuna, Cyprinidae, Gobiidae, Palaemonidae, Penaeidae.

List of plants found in the nature biotope: Eichhornia crassipes, Eleocharis. Fishes lay their eggs and take shelter under many aquatic plants Halda rivers of Bangladesh.

Threats to the ecology: Really poor and influenced by multiple pressures like untreated household effluents solid waste, agricultural pesticide and industrial plant near by to Halda river activities affluents in the forested region of the basin are in good quality. The water management system (drainage and irrigation).

Sources of information:
https://en.wikipedia.org/wiki/Halda_River
www.haldariver.org/about%20halda.html
www.haldariver.org/banglapedia.org/index.php?title=Halda_River

Comments of the members of the jury of Biotope Aquarium Design Contest 2018