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Electronic tagging has revealed repeated daily vertical patterns in sixgill behavior.
Tagging studies show sixgill sharks perform diel vertical migrations, shifting from deep daytime refuges to shallower nighttime feeding zones. These movements can span thousands of feet within a single night cycle.
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Such migrations expose them to rapid temperature and pressure transitions that would stress many marine animals. Their physiology tolerates these gradients without decompression trauma.
By bridging ocean layers daily, sixgills connect ecological zones that otherwise function independently. Few vertebrate predators move so freely between near-surface and abyssal realms.
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