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Stream in Aik Seruk, Spot 1, Sijuk District, Belitung, Indonesia
Indonesia, Belitung Regency, Kecamatan Sijuk
This biotope is located in a stream of the Aik Seruk River, Sijuk District, Belitung Island, Indonesia. While the area serves as a natural habitat for various exotic fish species, this project specifically focuses on Rasbora sp., Striuntius lateristriga, and Pristolepis grootii.
The stream has a moderate current, and its banks are rich with roots, tree trunks, gravel, and rocks. The water quality is quite dynamic: sometimes clear, other times slightly darkened by tannins, and it occasionally becomes murky after rain.
- Submitted by
- MAA Rafsanjani
- Approved by
- Heiko Blessin, Heok Hee Ng & Greg Martin
- GPS
- -2.6588750, 107.7036667
- Geographical region
- Southeastern Asia
- Drainage Basin
- Local Belitung Island coastal watershed, which empties into the surrounding sea (Karimata Strait/Java Sea)
- River catchment
- Aik Seruk
- Water body type
- Stream
- Water body name
- Stream in Aik Seruk
- Water body part
- Open water
- Water body course
- Middle course
- Water body: tributary of
- Stream
- Tributary name
- Aik Seruk River
Videos above and below water
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Water Chemistry
Water information
- Water type
- fresh-water
- Water color
- Mixed water
- Water transparency
- Medium
- Concentration of sediments
- Medium
- Water temperature
- 27 °C
- Water flow/curent
- Slow
Chemical parameters
- pH
- 7.0
- Conductivity
- 31
- GH
- 249 mg/l
- dGH
- KH
- 9 mg/l
- dKH
- Dissolved Oxygen
- 81 %
Substrate in nature
- Sand
- Grey
- Pebble/Gravel
- Mixed
- Stone
- Mixed
- Stone form
- Roundish
- Silt/Mud
- Grey
- Leaves
- None
- Driftwood
- Few
- Submerged terrestrial vegetation
- None
Aquatic Biotope
- Date of collecting
- 15 March, 2025
- Collecting area
- River bank
- Water depth
- 1,0m
- Air temperature
- 27 °C
- Sunlight
- Partial shade
Environment
- Environment
- Untouched
- Surrounding area
This biotope is located far from human settlements, deep within the forest as a tributary of the Aik Seruk River. The area is rich in wildlife and native plant species.
The location is rarely visited, except by fishermen, anglers, hunters, and researchers. As a result, the ecosystem remains largely undisturbed and well-preserved.
- Underwater landscape
The water conditions in this biotope are quite dynamic. At times, the water is clear; at other times, it becomes slightly darkened by tannins—mainly due to logging for oil palm plantations further upstream. After rainfall, the water also tends to become somewhat murky.
The riverbed consists of a mix of gravel, soil, and rocks, while the banks are rich in tree roots, driftwood, stones, and branches. As you venture deeper into the forest along this tributary, aquatic vegetation becomes more noticeable, although I have not yet identified the specific plant species present. I hope to continue exploring this stream to gather more detailed information.
Fish list:
- Rasbora cf. patrickyapi (Danionidae)
- Pristolepis grootii (Pristolepididae)
- Striuntius lateristriga (Cyprinidae)
- Threats to ecology
Belitung is currently facing an environmental emergency due to widespread deforestation for oil palm plantations, posing a significant threat to the island’s flora and fauna.
We have observed that several areas near the biotope location have already been converted into oil palm fields. Furthermore, some sites where wild Betta fish were once commonly found now see these fish only rarely. We sincerely hope the Indonesian government takes decisive action to preserve Belitung’s biodiversity.
Riparian zone
- Trees near the aquatic habitat
-
Many -
Bibliography
-
→ UPAYA PELESTARIAN IKAN ENDEMIK KEPULAUAN BANGKA BELITUNG. Jurnal Perikanan Unram, 13(4), 1122–1129.
by Bidayani, E., Robin, R., & Anjani, T. P.
-
CEMPEDIK: Entitas Ikan Pulau Belitung.
by Kurniawan, A., Kurniawan, A., & Fakhrurrozi, Y.
-
Adaptasi Ikan Sepatung (Pristolepis grootii) Dalam Wadah Budidaya
by Muslim, M.
Comment by the expert
Heok Hee Ng: Rasbora cf. patrickyapi is actually Rasbora einthovenii.
Greg Martin: Well researched. Nice to see the underwater BIN footage.
