EASTHAM, Mass. (WHDH) -- Nauset Light Beach in Eastham reopened Saturday after a shark sighting off the shore shut down the beach for several hours Friday. On beaches across the cape looking for sharks is becoming part of the fun this summer.

“We were keeping our eye on the horizon, all the time, mostly we saw seals,” said Suzy Ein.

Ein was vacationing with her family in Orleans, when she pulled out her camera at Nauset beach on Friday.

When they got home and zoomed in, they saw something unexpected.

“I have a zoom lens that I had for catching pictures of the kids in the waves and realized it looked nothing like a seal, it looked like a dorsal fin,” said Suzy Ein.

John Cartisser and Suzy Ein said the fin was so far out you couldn't see it with the naked eye. At the time they snapped these pictures, their kids were in the water.

“It wasn't till we took the camera home and could hook it up and blow up the photo a bit that we realized it did look a lot like a dorsal fin,” said Ein.

Beachgoers in Orleans said they were prepared for the possibility of another shark sighting. After the unforgettable picture of a kayaker being trailed by a shark was snapped at Nauset beach last weekend. The image may be the most famous of this summer's sightings - but it's also just one of a growing number of shark snapshots.