Surfing in Australia and Bali

Hey Guys,
My parents have promised me a surf trip to Australia and possibly Bali if I can pull all A's this semester and recently I have been doing some research and alot of people are saying how sharky Australia is and I'm getting a little nervous. Are there alot of sharks in Australia as compared to Florida? How about Bali? What can I do to protect myself? I have heard of a little box like thing that you put near your fins on your board, and it is supposed to emitt electric pulses to ward off sharks do these work? Thanks.
Respectfully,
Bucky
My parents have promised me a surf trip to Australia and possibly Bali if I can pull all A's this semester and recently I have been doing some research and alot of people are saying how sharky Australia is and I'm getting a little nervous. Are there alot of sharks in Australia as compared to Florida? How about Bali? What can I do to protect myself? I have heard of a little box like thing that you put near your fins on your board, and it is supposed to emitt electric pulses to ward off sharks do these work? Thanks.
Respectfully,
Bucky