What adaptation helps some deepwater Spiny Dogfish species camouflage in low light?

Answer

Bioluminescence

Some deep-dwelling Spiny Dogfish have specialized organs that produce light, which scientists theorize aids in attracting prey and neutralizing the shark's shadow via counter-illumination camouflage.

What adaptation helps some deepwater Spiny Dogfish species camouflage in low light?

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All About Pacific Spiny Dogfish - Shark and Ray Awareness Day

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