This week on National Beer Day, Carnival Cruise Line raised a glass to the success of Australia’s first bespoke cruise beer – ThirstyFrog Summer Ale – at the Lord Nelson Brewery in Sydney’s historic The Rocks precinct. 200,000 schooners of ThirstyFrog, developed by the local brewery, have been enjoyed at sea since Carnival Cruise Line introduced the craft ale three years ago.Created in partnership with The Lord Nelson Brewery, ThirstyFrog Summer Ale has proved one of the most popular beers on Australia-based ships Carnival Spirit and Carnival Legend. In fact, the partnership is such a success that Carnival has now rolled out similar partnerships with 10 local craft breweries in homeports in the U.S. and has even introduced an onboard brewery.Celebrating the three-year milestone at a special event at Sydney’s The Lord Nelson Brewery Hotel on the United States’ National Beer Day (April 7), Carnival Cruise Line Vice President Beverage Operations Eddie Allen said ThirstyFrog Summer Ale had paved the way for the cruise line to work with similar breweries around the world.“As a nation of beer lovers, it’s no surprise that ThirstyFrog Summer Ale has been a huge hit on our Australia-based ships. We worked closely with The Lord Nelson to create a quality beer that Australians would appreciate and enjoy,” Mr Allen said.“Following the success of Australia’s summer ale, we’ve rolled out similar partnerships with no less than 10 local craft breweries in homeports in the States. And because our guests have such a penchant for craft beer, we’ve even taken the process to sea with the craft brewery on Carnival Vista proving to be a huge hit. We expect similar results when Carnival Horizon debuts with her own onboard brewery.”ThirstyFrog Summer Ale, which takes its name from the RedFrog pubs on Carnival Cruise Line’s fleet, is only available on tap onboard Carnival Spirit and Carnival Legend. The beer is a 100 per cent natural ale, which combines Australian and American hops to create subtle malt flavours and floral citrus aromas in a thoroughly drinkable beer, which was designed to capture the spirit of a holiday at sea.Since the beer was launched on the cruise line’s Australia-based ships in 2014, Carnival Cruise Line has become one of The Lord Nelson Brewery’s biggest outlets in Australia.