Osphronemus Septemfasciatus changing pattern video

This video demonstrate how the Giant Borneo gouramy changes its pattern according to its mood. It can formed the common Giant Gouramy concave pattern and switched to the Giant borneo gouramy tappered pattern at a snapped of a finger.

I've never encountered a fish that can change its pattern to disguise as another species. Why do they display this behavior?

Concave Bar

Tappered Bar

Changing bar pattern

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The science behind Channa Marulioides colors and pattern

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