Despite bitterly cold conditions, Terri Irwin launched the zoo's whale watching boat dubbed Steve's Whale One, in memory of her late husband.
The vessel, named by the couple's children Bindi and Bob, will take guests in search of whales migrating up the east coast of Australia.
Departing from Mooloolaba Wharf on Queensland's Sunshine Coast, the 130-man boat will offer 360-degree views from large observation decks.
Guests can also listen to the whale songs using an underwater hydrophone, while a biologist will be on board to explain and discuss the gentle giants.
"We hope the trip will make people fall in love with the whales so much that they become a fully fledged supporter of whale conservation," said Australia Zoo spokeswoman Natalie Hodgskin.Celebs and Bubs
Heath Ledger
Princess Diana
Steve Irwin
James Dean
Marilyn Monroe
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