Murdoch Fonda Munro had nine dozen shucked Pacific oysters stacked in his fridge.
He wanted to sell them and posted on a Facebook page advertising the tasty sought-after morsels as "picked, shelled and cleaned today".
At $20 a container it was a bargain - but totally illegal.
For the 47-year-old Whangarei scaffolder it wasn't cash he made from using social media but a court date when officers from the Ministry of Primary Industries were alerted to the post.
Munro was fined $1000 and ordered to pay costs after he was found guilty of possessing rock oysters for sale without a licence, after advertising them for sale on a closed Facebook group in October 2017.