dorsal

Winter had put a life vest on the dog resembling a shark, with a dorsal fin protruding from its back.

Yet sea robins are most notable for their distinctively large, fan-shaped dorsal fins and for their six leg-like appendages.

The dorsal fin is like a dolphin's fingerprint, as each has distinctive notches, ridges and pigmentation.

Wide and pitch black, it had no dorsal fin.

“I never thought I’d be holding the dorsal fin of a great white shark and applying this type of technology,” Michalove said.