In the past three weeks, there have been seven people attacked by sharks along the North Carolina coast.

A number of public beaches were forced to close last month because of sharks being seen near the shore. There have already been at least 11 reported shark attacks nationwide this year. 

The most recent attack occurred just last week when a 68-year-old man was attacked by a shark in waist-deep water in North Carolina.

On "Fox and Friends," Clayton Morris spoke with shark expert and co-founder of the Long Island Aquarium Joe Yaiullo about why there has been an increase in attacks. 

"There's lots of different theories. Some of it could be just [there are] more bait fish in the area, warmer waters, things like that," Yaiullo said. "Some of it's just a natural cycle of things and there are more people in the water."

Yaiullo provided a number of tips for beachgoers to try to avoid shark-infested waters.

He advised that people should avoid swimming early in the morning and during dusk, because that is the normal feeding time for sharks. Yaiullo said people should avoid swimming in areas where fishing bait is present and to swim in protected waters.

"Once you’re in the water, you’re in their domain and you become part of the food chain," Yaiullo added.

Watch more in the video above. 

Man Attacked By Shark on Ocracoke Island in North Carolina

Beachgoers Witness Massive Shark Feeding Frenzy

Here's an Idea: Use a Drone to Find Sharks, Warn Swimmers