"We're committed to Northland water space and this purchase reflects our desire to hang on in there. The rationale behind the purchase is to do the best we can to keep our own farms viable and our own people employed."
The fate of two former Sanford workers is still under discussion.
While the amount paid for the 16 oyster farms has not been disclosed, the sale would mean a $2 million loss for Sanford in its second-half earnings this year, according to business analysts.
Sanford closed the Kaeo plant in December last year after a massive hit by the herpes virus that has killed 70-80 per cent of juvenile oysters in Northland and Coromandel since 2009.
Sanford said at the time it was confident the medium term outlook was positive as there was potential to breed oysters with resistance to the OsHV-1 herpes virus. The company had since opted to focus on its expanding greenshell mussel business, managing director Eric Barratt said.
"We just wanted to be out of the Pacific oyster business, and this was a good transaction from both sides," he said.
Sanford and Aotearoa Fisheries believe the sale strengthens both companies and therefore helps the local aquaculture industry to continue to flourish, the company said.
Aotearoa Fisheries comprises Moana Pacific Fisheries, OPC Fish and Lobster, Prepared Foods, Pacific Marine Farms and Kia Ora Seafoods, and owns half of the Sealord Group Limited.