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Small Blackwater stream in Lalang Tanjung
Indonesia, Riau Province, Lalang Tanjung
Lalang Tanjung is located in the Meranti Islands Regency in the province of Riau, Indonesia. The water found are the type of peat blackwater which are dominant along the forest stream. The peat soil and dried leaves contribute to the acidic tannins. The water pH varies between 4-5; temperature is around 24-26°C. The type of vegetation mainly consist of ferns and moss, also some riparian grass like Sphaerocaryum sp., while a variety of species of small fishes, such as Brilliant rasbora, Betta simorum and Chocolate gourami, can be found living in this type of habitat.
- Submitted by
- Andre Chandra
- Approved by
- Greg Martin & Peter Unmack
- GPS
- 0.9023000, 102.6445999
- Geographical region
- Southeastern Asia
- Drainage Basin
- River catchment
- Sungai Tohor
- Water body type
- Stream
- Water body name
- Sungai Tohor
- Water body part
- Water body course
- Middle course
- Water body: tributary of
- Stream
- Tributary name
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Water Chemistry
Water information
- Water type
- fresh-water
- Water color
- Black water
- Water transparency
- High
- Concentration of sediments
- Low
- Water temperature
- 24-26 °C
- Water flow/curent
- None
Chemical parameters
- pH
- 4.0
- Conductivity
- GH
- dGH
- KH
- dKH
- Dissolved Oxygen
Substrate in nature
- Sand
- None
- Pebble/Gravel
- None
- Stone
- None
- Stone form
- Silt/Mud
- Leaves
- Many
- Driftwood
- Few
- Submerged terrestrial vegetation
- no
Aquatic Biotope
- Date of collecting
- May 2021
- Collecting area
- Centre
- Water depth
- 0,5m
- Air temperature
- Sunlight
- Partial shade
Environment
- Environment
- Untouched
- Surrounding area
The surrounding area is still mostly untouched; most of the villages were located distant from the spot, whic has only been used by small numbers of villagers to fish.
- Underwater landscape
The water is filled with leaf litters, few twigs, branches and trunks in the banks, the only sediment is peat.
Fish:
- Rasbora einthoveinii
- Rasbora kalochroma
- Sphaerichthys osphromenoides
- Desmopuntius hexazona
- Betta simorum
- Betta pugnax
Crustaceans:
- Threats to ecology
Riau province is known to be a province with a high amount of palm oil plantations. Land developments for palm oil may cause problem to the ecology, as most of land clearance requires burning forest and often this may cause habitat destruction for the fish.
Riparian zone
- Trees near the aquatic habitat
-
Many -
Comment by the expert
Greg Martin: Well researched.
Peter Unmack: Overall a very solid effort.
