Comvita chief executive Brett Hewlett said it was a strategic investment as Omega-3 fish oils had become a core ingredient platform for Comvita.
SeaDragon said the new capital would be sufficient to meet its investment requirements for the immediate future, including the completion of its omega-3 oil refinery in Nelson, the addition of a fractionation plant at the refinery, the upgrade of its existing manufacturing facility, and working capital.
SeaDragon chairman Colin Groves said Comvita's commitment was a big win for adding value to New Zealand's primary sector and a significant endorsement of SeaDragon's strategy.
"It brings together two New Zealand-owned companies with complementary expertise to develop the greatest value from the country's precious primary resources," he said.
"Comvita, with its extensive international distribution network and premium brand image, particularly in fast-growing Asian markets, has the capability to make the most of this opportunity."
Comvita and SeaDragon have also undertaken to negotiate and enter into a supply agreement giving Comvita rights of first refusal to all SeaDragon products. The price for supply has yet to be agreed.
Mr Grove said Comvita would become a significant domestic customer, while its standing in New Zealand's export community and its contribution to the SeaDragon board would assist it to achieve its growth ambitions.
The companies said they were committed to working with the wider New Zealand fishing industry in the pursuit of maximising value from sustainably harvested local seafood resources. A Comvita representative will join the SeaDragon board after the completion of the rights offer.
SeaDragon
* New Zealand's largest refiner and blender of omega-2 and omega-3 fish oils.
* Based in Nelson.
* Has the capacity to produce 5000 tonnes of refined oil a year.
* Listed on the NZX.