TWO and a half years after an exotic disease was introduced to the Logan River, tests have found no sign of white spot disease in prawns and fish.
Production is set to double later this year and if negative tests continue, Australia will be declared white spot free next year.
Millions of dollars worth of prawn stocks were destroyed after the disease was found, putting prawn farmers out of business.
The disease was thought to have been introduced by amateur fishermen using imported supermarket seafood like prawns for bait.
Fisheries Minister Mark Furner said prawn and marine worm samples taken from Moreton Bay, Logan and Brisbane Rivers all returned negative results.
"This is the second consecutive surveillance round conducted by my department which has returned negative results for the virus that causes white spot disease," Mr Furner said.
"...This means everyone must continue to remain vigilant to ensure the disease is contained and does not spread.
"I thank the industry for its resilience and patience during this hard time, and the general community, especially recreational fishers for heeding our messages and helping stop the spread of the disease."
Australian Prawn Farmers Association president Matt West said businesses had gone through much financial and mental stress with Logan farms having to shut down for lengthy periods in order to eradicate the disease.
"Everyone has done an amazing job, but we've had a wake-up call to remain vigilant, not just for white spot but other diseases coming into the country," he said.
"It's imperative we boost exotic disease testing regimes at our borders to prevent any other major disease outbreaks.
"...There's such unlimited demand for our prawns. Seafood suppliers take everything we can produce."
White spot is a highly contagious viral infection that affects crustaceans, prawns and crabs, but it is not harmful to human health and seafoods are safe to eat.
Line fishing is not permitted at prawn farm inlet and outlet channels.
Movement restrictions also remain for raw prawns, yabbies and marine worms in south east Queensland. Three of seven prawn farms restocked ponds in summer and the biggest operator harvested 421 tonnes.