Ministry of Primary Industries quarantine officers inspected the yacht when it arrived in Opua as part of biosecurity and customs checks.
Mrs Barre had declared that there was no meat or fruit products on board.
She said she was aware of New Zealand's biosecurity regulations and had deliberately kept the ships stores low.
When the inspectors found the delectable stash of food Mrs Barre said she didn't declare the food because she wanted to eat it. She said she hid the food to avoid officials seizing it.
MPI Manager north cargo Stu Rawnsley said the food items could have been harbouring animal diseases such as foot-and-mouth disease, or pests such as Queensland fruit fly.
"Either could have a devastating effect on the New Zealand economy."
Mrs Barre was fined $3000.
"The conviction and fine sends a message that yachties will face harsh consequences if they don't take our biosecurity rules seriously," Mr Rawnsley said.
MPI stepped up its border controls for visiting yachts in Northland this season following Queensland fruit fly scares in Whangarei last year, including additional quarantine officers that have been brought in to check vessels after the initial inspection is completed.
During the season MPI inspected 381 yachts at Marsden Cove and Opua.
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