"The rules around what you can and can't do with recreational catch are clear. If people have broken the law, they will be fined accordingly."
Peti Elizabeth Mark had been advertising crayfish for sale on a closed Facebook group page, detailing the prices as $40 for a large specimen, $30 for medium and $25 for small.
She had also stated she had 11 crayfish for sale, and would sell a bulk lot for $250. A short time later the post was amended to nine crays for sale for $200.
Mr Rudsdale said Mark subsequently told Fisheries officers that she only had three crayfish, two of which she sold for $40 each, and that the other had been eaten. She had spent the money from the sale of the two crayfish on dinner.
Social media was proving to be a powerful tool in uncovering fishing-related offences, he added.
"Both of these cases were a result of information from the public. The people who tipped us off obviously knew it was illegal to sell fish or shellfish caught recreationally," he said.
"The rules are clear, but if you're unsure, we are always happy to advise on what you can and can't do. If in doubt, give us a call, or post your query on our Facebook page."