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Marinjung bridge, Sungai Cimaja, Sukabumi, Indonesia

Sponsored by

Indonesia, Jawa Barat, Sukabumi

Cimaja River is one of the rivers that flows from Mount Halimun National Park into the Indian Ocean. The southern region of Mount Halimun National Park is a unique and very specific area. It was formed from the geological process “Bayah Dome”.

This geological process makes this river seem to have no access to other freshwater rivers on the island of Java. Therefore, this river is inhabited by the amphidromus goby species.

Submitted by
Margo Prasetya
Approved by
Greg Martin & Peter Unmack
GPS
-6.9525447, 106.4818420
Geographical region
Southeastern Asia
Drainage Basin
Bayah Dome River
River catchment
Mount Halimun National Park
Water body type
River
Water body name
Sungai Cimaja
Water body part
Open water
Water body course
Lower course
Water body: tributary of
River
Tributary name
Sungai Cimaja

Videos above and below water

Water Chemistry

Water information

Water type
Fresh water
Water color
Clear water
Water transparency
Medium
Concentration of sediments
Medium
Water temperature
22-27 °C
Water flow/curent
Strong

Chemical parameters

pH
7
Conductivity
GH
100 mg/l
KH
90 mg/l
Dissolved Oxygen

Substrate in nature

Sand
Grey
Pebble/Gravel
Grey
Stone
Mixed
Stone form
Roundish
Silt/Mud
Brown
Leaves
no
Driftwood
Few
Submerged terrestrial vegetation
no

Aquatic Biotope

Date of collecting
20/03/2020
Collecting area
River bank
Water depth
0,2m
Air temperature
30 °C
Sunlight
Full sun

Environment

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

This biotope environment, is located close to the estuary, about 0.5-1 km from the coast. The strength of the water current causes the water to be fresh. This river is known as a dangerous river because of the sudden floods.

In the northern part of the Marinjung bridge, the banks of the river are still covered with forests and fields. while the southern part of the bridge is more likely to be a fish pond owned by residents.

Underwater landscape

The bottom of the river is very rocky with a predominance of rounded and beautifully colored stones.

Fish: Awaous grammepomus, Sicyopterus macrostatholepis, S. microcephalus and S. micrurus. Schismatogobius marmoratus, Stiphodon elegans, Gymnothorax polyumnodon, Anguilla bicolor and Puntius Binotatus.

Threats to ecology

The ecology of this river is very vulnerable to the presence of foreign species such as cichlid fish and suckermouth catfish.

The geological history that takes place in this area makes the types of fish in the southern river of Mount Halimun different from the types of fish that are common in Java. On the island of Java, there is no river that has as much population and variety of goby fish as this river. Even people in Java are very foreign to this type of goby fish.

Riparian zone

Trees near the aquatic habitat
Few - Pennisetum purpureum, Cocos nucifera

Comment by the expert

Greg Martin: Well researched.

Peter Unmack: I really good level of details across the categories. Good bibliogrpahic sources.