What specialized adaptation allows the longnose gar to survive in warm or stagnant waters with low oxygen?

Answer

It gulps atmospheric air via a connection between its swim bladder and pharynx/esophagus

Gars possess a highly vascularized swim bladder connected to their pharynx or esophagus, enabling them to gulp atmospheric air, a process known as facultative air breathing.

What specialized adaptation allows the longnose gar to survive in warm or stagnant waters with low oxygen?
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