To about 12 ft (3.7 m).
Cape Cod, MA, and Georges Back to FL, including Gulf of Mexico and Caribbean Sea.
Continental waters inshore to outer continental shelf and adjacent oceanic waters.
Sandbar shark, and bignose shark have higher first dorsal fins originating farther forward. Sandbar shark, most difficult to distinguish, attains smaller maximum size. Bignose shark has longer snout. Silky shark has second dorsal fin with free tip length usually more than twice fin height. Night shark has green eyes. Bull shark and Spinner shark lack interdorsal ridges.
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Text descriptions taken from Guide to Sharks, Tunas, & Billfishes of the U.S. Atlantic and Gulf of Mexico |
Dusky shark length-weight relationship
Differences between dusky and sandbar sharks
Canadian Shark Research Laboratory
Ichthyology at the Florida Museum of Natural History