David and Elana Barnes posted a video of their 5-year-old daughter swimming with sharks onto YouTube. However, they still would have let Anaia, 5, swim with sharks during their vacation in the Bahamas because life is too short to be boring, they argued on ABCs Good Morning America today. Elana wrote- We swam with Reef, Lemon, and Nurse sharks, all very low on the aggression index, yet still very thrilling! Put it on your bucket list! Nurse sharks and lemon sharks are generally gentle and not aggressive towards humans whereas reef sharks are considered to be more of a threat to humans.