Against several hundred other entries from around the world, Blue Moon recently won top accolade of Best Film at the annual Drake Fly Fishing Video Competition in Denver in the United States.
Drake's Fly Fishing is one of the country's most popular magazines and runs one of the largest fishing expos.
On The Fly Productions producer Carl McNeil said the film is on a year-long 40-city film tour around the United States.
"Since the Drake [competition] in Denver, sales in the US tripled overnight," he said.
The story recounts the unpredictable, possibly only once-every-decade, explosion of Fiordland's mouse population caused by flowering beech forests which deliver a waterborne conveyor belt of food to rarely seen, large, predatory brown trout.
The 36-minute DVD, edited from more than 400 hours of footage shot over three years, was filmed around Fiordland's pristine lakes and waterways.
It targeted anglers, their families and friends, Mr McNeil said.
"We wanted a film with appeal beyond just the hard-out angler.
"It's shot in some of the most remote and beautiful parts of the country."
Blue Moon has received rave website reviews and its YouTube clip has attracted more than 100,000 hits, prompting Mr McNeill to order a minimum second pressing of 2000 disks.
Mr McNeil, one of only two US Federation of Fly Fishers' certified casting instructors in New Zealand, said distribution deals had been struck in Europe and the United Kingdom, Japan, New Zealand and Australia, with negotiations under way for South Africa.
He also had an eye on the South American market.
