article_snippet.sent: Stay out of the water: When the following pictures were posted to Facebook, users theorized that A swarm of sharks was a mix of Blacktip and Spinner sharks .
article_snippet.sent: Blacktip and Spinner sharks migrate each year to breed in shallower waters . '
article_snippet.sent: It looked like Blacktip and Spinner sharks had traveling in mind.
article_snippet.sent: Blacktip and Spinner sharks were heading north,' John Massung told NBC Miami.
article_snippet.sent: Most responded that Blacktip and Spinner sharks looked like either Blacktips or Spinners, which migrate this time of year to breed.
article_snippet.sent: John Massung says Blacktip and Spinner sharks were still out in the water on Friday, but the conditions weren't clear enough to photograph the scene.
article_snippet.sent: Above, a stock image of a Blacktip shark, one of the species of shark thought to be seen in the pictures taken Thursday near Sebastian Inlet .
highlights_snippet.sent: The sharks pictured swarming 100 feet off the beach are thought to be Blacktip or Spinners - which migrate this time of year to breed .