Fishermen who had previously depended on shark-finning for their livelihoods now bring the sharks they catch to Friese's nursery, where visitors can dive with sharks and get to watch as sharks are rescued, tagged and released.
"Guests have told me they will never touch a bowl of shark fin soup again," says Paul Friese. "These reactions push me to see how far the shark conservation nursery can grow."
Bali Sharks, Agus Bar and Restaurant, Jl. Tikad Punggawa, Serangan, Bali; +62 361 996 5101; tours are $100 per adult, $90 per child, free for children under five
Also on CNN: More airlines ban shark's fin cargo
Thresher Shark Divers
Malapascua's Monad Shoal was recently made into a marine park to protect thresher sharks.
"This is the only place threshers can be seen every day," says Andrea Agarwal, owner of Thresher Shark Divers.
Threshers' tails can make up half their length, and they can grow up to six meters long.
"If you are here for a few days you will almost certainly get a good sighting," says Agarwal.
Divers will need to be open water certified as threshers are usually found in deep waters.
The best time to see the shy sharks is in the early morning.
Thresher Shark Divers, Bounty Beach, Malapascua, Philippines; +63 917 795 9433; contact email@example.com for rates
Guadalupe's large population of great whites makes the island an important site for shark researchers.
The clear waters are great for cage-diving.
This six-day live-aboard takes divers from San Diego across the border to Isla Guadalupe.
The tour provides meals, accommodation and beer and wine after the shark encounters.
Both divers and non-divers can participate.
Shark Divers, +1 855 987 4275/+1 619 887 4275; inclusive packages start at $3,100 per person
Hawaii Shark Encounter
Hawaii is home to more than 40 species of sharks ranging from small deep-water pygmy sharks to bus-sized whale sharks.
Common sightings include reef sharks, sandbar sharks and hammerheads.