Police were notified of the theft on Wednesday and Gregory understood they were trawling through CCTV to find those responsible.
He said oyster farmers were extremely vulnerable to theft because it was difficult to monitor farms 24 hours a day.
Qyster is based near Aroha Island in the Kerikeri inlet.
However, the Marine Farmers' Association was discussing how to address the issue.
“The way of thinking at the moment is that oyster farmers are going to start putting signs up making it very clear to thieves [that] you will be prosecuted.”
Another method to stop oyster farmers being targeted was the possibility of land-based oysters.
Information can also be provided anonymously via Crime Stoppers on 0800 555 111.
Brodie Stone covers crime and emergency for the Northern Advocate. She has spent most of her life in Whangārei and is passionate about delving into issues that matter to Northlanders and beyond.