A predatory use of counterillumination by the squaloid shark, Isistius brasiliensis
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- Widder, E.A. Environmental Biology of Fishes (1998) 53: 267. doi:10.1023/A:1007498915860
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A number of very unusual morphological and behavioral characteristics attributed to the cookie-cutter shark, Isistius brasiliensis, may be explained by a novel use of counterillumination. Specifically, it is proposed that a band of pigment, located beneath the jaw and bounded by ventrally directed bioluminescence, acts as a lure which mimics the search image of many upward-looking pelagic predators.