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Hill stream Gesing, Central Java, Indonesia

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Educated by Nature

Indonesia, Central Java, Kaligono, Purworejo Regency

The Gesing stream is one of the tributaries of the Bogowonto River which flows from the mountainous National Park. The distance from the headwaters to the Bogowonto River is approximately 20km.

The Menoreh Mountain area is geomorphologically complex. Some of the rocks found include: sandstone, sandy marl, claystone, and limestone of the Middle Eocene; andesitic rocks, andesite breccias and tuff which are the result of Menoreh Volcano activity in the Oligocene; limestone and coral deposited in the Lower Miocene; and colluvium material deposited in the Quarter Age.

Therefore, this river is inhabited by the amphidromous goby.

Submitted by
Imanul Chakim
Approved by
Heok Hee Ng & Greg Martin
GPS
-7.7363110, 110.0875320
Geographical region
Southeastern Asia
Drainage Basin
The western side of the mountains is incised
River catchment
Sungai Gesing
Water body type
Stream
Water body name
Sungai Bogowonto
Water body part
Channel
Water body course
Headwaters
Water body: tributary of
Hill streams
Tributary name
Sungai Gesing

Videos above and below water


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Water Chemistry

Water information

Water type
fresh-water
Water color
Clear water
Water transparency
Medium
Concentration of sediments
Medium
Water temperature
25-28 °C
Water flow/curent
Strong

Chemical parameters

pH
8.0
Conductivity
GH
100 mg/l
dGH
KH
90 mg/l
dKH
Dissolved Oxygen

Substrate in nature

Sand
Beige
Pebble/Gravel
Mixed
Stone
Mixed
Stone form
Irregular
Silt/Mud
Beige
Leaves
Many
Driftwood
Few
Submerged terrestrial vegetation

Aquatic Biotope

Date of collecting
07.08.2023
Collecting area
River bank
Water depth
0,5m
Air temperature
29 °C
Sunlight
Full sun

Environment

Environment
Affected by human activity
Affected by human activity
Agriculture
Agriculture
Little
Surrounding area

The area around the river is filled with shrubs and wild trees, one of which is bamboo, its dry twigs and leaves fall into the river.

Underwater landscape

The stream in this river area has a lot of vegetation above the water that grows on the banks of the river and also trees so that the roots look beautiful on the banks of the river. Some of the rocks are covered with algae and are food for fish, especially Sicyopterus fish.

Fishlist:

  • Stiphodon semoni (Gobiidae)
  • Stiphodon pelewensis (Gobiidae)
  • Stiphodon atropurpureus (Gobiidae)
  • Stiphodon aureofuscus (Gobiidae)
  • Lentipes ikeae (Gobiidae)
  • Sicyopus rubicundus (Gobiidae)
  • Sicyopterus hysterophorus (Gobiidae)
  • Sicyopterus microcephalus (Gobiidae)
  • Sicyopterus cynocephalus (Gobiidae)
  • Sicyopterus microcephalus (Gobiidae)
  • Sicyopterus lagocephalus (Gobiidae)
  • Barbodes binotatus (Cyprinidae)
  • Nemacheilus fasciatus (Nemacheilidae)
  • Rasbora argyrotaenia (Danionidae)
  • Macrognathus maculatus ()
  • Homaloptera ocellata (Balitoridae)
  • Rhyacichthys aspro (Rhyacichthyidae)
Threats to ecology

Gobiids are very beautiful and are starting to become rare at this time because of the damage to the river, its pollution and many tourists visit and only in this place there are still many types of goby fish.

Riparian zone

Trees near the aquatic habitat
Many -

Bibliography

Comment by the expert

Heok Hee Ng: Fishes listed are not entirely correct. Some of the gobies mentioned are not known from Java. Threats are not fully explained.

Greg Martin: Thorough.