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The rocky habitats of Lake Malawi, Tanzania

Sponsored by

Tanzania, Malawi, Ruvuma Region

The rocky habitats of Lake Malawi – free of sedimentary deposits, with many cracks somewhere between the island of Lundo and the large settlement of Liuli – were taken as an example in the creation of my biotope aquarium of the underwater world.

Submitted by
Artem Bereznev
Approved by
Ad Konings & Stefano Valdesalici
GPS
-11.2218790, 34.7487946
Geographical region
Eastern Africa
Drainage Basin
Lake Malawi
River catchment
Ruhuhu River
Water body type
Lake
Water body name
Malawi
Water body part
Pool
Water body course
Middle course
Water body: tributary of
River
Tributary name
Shire

Videos above and below water

Water Chemistry

Water information

Water type
Fresh water
Water color
Clear water
Water transparency
High
Concentration of sediments
Medium
Water temperature
24 °C
Water flow/curent
Slow

Chemical parameters

pH
8.5
Conductivity
240
GH
10 mg/l
KH
6.6 mg/l
Dissolved Oxygen
90 %

Substrate in nature

Sand
Grey
Pebble/Gravel
Grey
Stone
Black
Stone form
Irregular
Silt/Mud
None
Leaves
no
Driftwood
None
Submerged terrestrial vegetation
no

Aquatic Biotope

Date of collecting
10/07/2021
Collecting area
Open water
Water depth
0,5m
Air temperature
28 °C
Sunlight
Partial shade

Environment

Environment
Affected by human activity
Affected by human activity
Pollution
Pollution
Moderate
Surrounding area

Coastline relief varies from rocky steep shores to extensive beaches.

Underwater landscape

The average water surface temperature in the lake ranges from 23 to 28°C. Seasonal changes in temperature and precipitation directly affect the transparency of the water: if on a hot February day visibility can be almost zero, then on a calm day in October it can be more than 20 m. In biotopes with a rocky bottom, the water is more transparent than in areas with a silty base. This biotope is a transitional aquatic landscape with both rocks and areas of sandy or silted bottom located at a sufficient depth.

Fish:

  • Labidochromis sp. “Hongi
Threats to ecology

The main threat is overfishing, a problem fueled by the population explosion that has occurred in Malawi over the past decades. Malawi’s population is growing at 2% per year, with almost half of the country’s population being children under 15 years of age. Fish provides up to 70% of the animal protein in the Malawians’ diet, and the demand for it is constantly growing. The annual catch of fish in the lake is declining slowly, but this is a consequence of increasing fishing activity and the use of prohibited fishing gear for smaller fish.

Riparian zone

Trees near the aquatic habitat
None -