In the deep twilight, velvet belly lantern sharks light up with a two-step system—hormones set a stealth glow for camouflage, while neural signals push quick flashes for signaling. We unpack the chemistry (melatonin, prolactin, GABA, nitric oxide), reveal their krill-dominated diet and ontogenetic shifts, and explain how regional environmental baselines shape isotopic niches, showing a level of deep-sea complexity that rewrites what we expect from lantern sharks.

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