One of New Zealand's most expensive seafood, whitebait is currently sold overseas for about $80 a kilogram, and Statistics New Zealand data published this week shows the country exported $108,688 worth of whitebait last year.
With four of New Zealand's five native whitebait species threatened, Gardiner expects commercial fishing of whitebait in the wild will eventually be restricted to protect the species, and sees a good opportunity for his company to offer a sustainable supply year round.
"I think if we are able to get 50 to 60 tonne in the next couple of years and then grow from there, there's certainly room in the market to be quite a bit bigger than that," he said.
The increased investment in larger facilities, while costly, will enable the company to step up production and turn a profit in the next few years, he said.
"The nature of the fish is the bigger they get the more eggs they produce - we will have more eggs than we can do anything with for quite some time," he said. "It will then just be down to how quickly we can build demand and then we can build production behind that and away we go. Biologically all of the conditions are right for it, it is really just building the physical requirements, and then getting it into market."
The company's investors aim to fund the investment themselves if possible, said Gardiner, who is the son of Wira Gardiner, a former deputy chair of Te Ohu Kaimoana, and former National MP Pauline Gardiner.
Its whitebait is sold under the brand Manaki, a Maori term referencing hospitality and care for the environment.
Shareholders of NZ Premium Whitebait include Ka Ora, a company whose owners include the Gardiners.