Whether you are a beginner or an experienced diver, you must know that there are sharks in Shell Key. While these animals are not often aggressive, they can be aggressive to humans. These powerful creatures can jump from 20 feet to 40 feet in the air, making them difficult to get near. For this reason, it's important to learn about local tide charts. If you're not sure about the current conditions, you can check with the Florida Fish and Wildlife Commission or visit local aquariums.