Malili Lake System

The Malili lake system consists of five interconnected lakes drained by the Larona River towards the west into Bone Bay. These five lakes are:

  • Lake Matano
  • Lake Mahalona
  • Lake Towuti
  • Lake Lontoa
  • Lake Masapi

Lake Matano (the northernmost lake) is connected by the Petea River to Lake Mahalona, which in turn is connected to Lake Towuti by the Tominanga River. Lontoa and Masapi are considered satellite lakes as they are not directly connected to the three major lakes, but are part of the Malili system nonetheless.

The image below illustrates this information.


There is great range in the surface area and depths of these lakes, and some variance in their water chemistry.

Lake Matano (Indonesian: Danau Matano)

As mentioned, Lake Matano is the northernmost lake of the Malili lake system. It has a maximum depth of 590m, making it the tenth deepest lake in the world. At 164.1km², its surface area is less than that of Lake Towuti, however.

The water parameters in the shallows of Lake Matano are as follows:

Temperature (°C) 28.7
pH 8.5
General hardness (°GH) 7
Carbonate hardness (°KH) 5
Conductance (μS) 175
Total dissolved solids (ppm) 87.5
Oxygen (mg/l) 6.93

The following shrimp species can be found within the lake:

  • Caridina dennerli
  • Caridina holthuisi
  • Caridina lanceolata
  • Caridina loehae
  • Caridina mahalona
  • Caridina masapi
  • Caridina parvula

Petea River

The Petea River connects Lake Matano to Lake Mahalona. Shrimp that are found within the river are not thus considered riverine, as it is considered an extension of either lake rather than a true river.

The following shrimp species can be found within the river:

  • Caridina holthuisi
  • Caridina lanceolata
  • Caridina loehae
  • Caridina masapi
  • Caridina parvula

Lake Mahalona (Indonesian: Danau Mahalona)

Lake Mahalona is south-east of Lake Matano and north of Lake Towuti. It is far smaller than the two, with a meximum depth of 73m. This lake is connected to Lake Matano and Lake Towuti by the Petea River and Tominanga River respectively.

The following shrimp species can be found within the lake:

  • Caridina holthuisi
  • Caridina lanceolata
  • Caridina lingkonae
  • Caridina masapi
  • Caridina striata
  • Caridina tenuirostris

Tominanga River

The Tominanga River connects Lake Mahalona to Lake Towuti. Shrimp that are found within the river are not thus considered riverine, as it is considered an extension of either lake rather than a true river.

The following shrimp species can be found within the river:

  • Caridina lanceolata
  • Caridina masapi
  • Caridina parvula
  • Caridina tenuirostris

Lake Towuti (Indonesian: Danau Touti)

With a maximum depth of 203m, Lake Towuti is dramatically shallower than Lake Matano. Despite this, Lake Towuti has the greatest volume of all the Malili lakes. This is due to its large surface area of 561.1km².

The water parameters in the shallows of Lake Towuti are as follows:

Temperature (°C) 29.2
pH 8.4
General hardness (°GH) 6
Carbonate hardness (°KH) 4
Conductance (μS) 146
Total dissolved solids (ppm) 73
Oxygen (mg/l) 7.15

The following shrimp species can be found within the lake:

  • Caridina glaubrechti
  • Caridina holthuisi
  • Caridina lanceolata
  • Caridina lingkonae
  • Caridina loehae
  • Caridina masapi
  • Caridina parvula
  • Caridina profundicola
  • Caridina spinata
  • Caridina spongicola
  • Caridina striata
  • Caridina tenuirostris
  • Caridina woltereckae

Larona River

The Larona River is to the west of Lake Towuti and drains the Malili lake system via Towuti Outlet Bay. Shrimp that are found within the river are not necessarily thus considered riverine, as it may considered an extension of Lake Towuti.

The following shrimp species can be found within the river:

  • Caridina lanceolata
  • Caridina masapi
  • Caridina tenuirostris

Lake Lontoa (Indonesian: Danau Lontoa)

Lake Lontoa is a satellite lake within the Malili lake system, and has a maximum depth of 2-4m.

The following shrimp species can be found within the lake:

  • Caridina masapi

Lake Masapi (Indonesian: Danau Masapi)

Lake Masapi is a satellite lake within the Malili lake system, and has a maximum depth of 2-4m.

The following shrimp species can be found within the lake:

  • Caridina masapi

General rivers, not considered extensions of lakes

These are the rivers that are not considered extensions of the lakes within the Malili lake system, and shrimp found within them are considered riverine.

The following shrimp species can be found within the rivers:

  • Caridina mahalona
  • Caridina masapi

Sources:

von Rintelen, K. & Cai, Y., (2009). Radiation of endemic species flocks in ancient lakes: systematic revision of the freshwater shrimp Caridina H. Milne Edwards, 1837 (Crustacea: Decapoda: Atyidae) from the ancient lakes Of Sulawesi, Indonesia, with the description of eight new species.Raffles Bulletin of Zoology57(2).

Logemann, F. and Logemann, C.. “http://blog.garnelenhaus.de”

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