Answer
Dolphins surface with arched backs and blowholes, often in groups with horizontal tail flukes; shark fins are more rigid triangles cruising without playful breaching. Distance and heat haze fool phones—do not clear the beach based on a blurry clip. Report unusual behavior to Beach Patrol or the Coast Guard with time and location.
Sources: U.S. Coast Guard · Ocean City Beach Patrol · Visit Ocean City
Editorial visitor guidance for Ocean City, Maryland. Confirm current Town of Ocean City, Maryland DNR, NPS Assateague, and NWS rules when regulations or safety apply.
