How does the viperfish utilize the hinged dorsal ray known as an esca?
Answer
It swings the glowing tip forward in front of its mouth to attract prey
The esca, which is a bioluminescent lure extending from the first soft ray of the dorsal fin, functions effectively as a fishing rod. The ray is highly mobile, connected by specific musculature that allows the fish to hinge it forward, positioning the glowing light directly in front of its massive mouth. This attracts curious or unsuspecting prey toward the strike zone, allowing the viperfish to capture food with a sudden, powerful movement while expending minimal energy.
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