Range
Labyrinth fish are endemic to freshwaters of Asia and Africa. In Asia, they are found throughout East, Southeast, and South Asia, especially but not exclusively in the warm, slow-flowing, low-oxygen waters. In Africa, significantly smaller numbers of labyrinth fish can be found in the lower half of the continent, with concentrations in the rainforest waters.
The characteristics of the fish habitats are indicators of the size of the labyrinth organ, as the organ size is negatively correlated with the level of oxygen in the waters. Species native to low-oxygen waters are more likely to have larger and more complex labyrinth organs than species found in fast-flowing, oxygen-rich waters.
Read more about this topic: Anabantoidei
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