Almost 40 tonnes of dangerous imports found stashed in a Sydney warehouse include boxes of frog and turtle meat, bird carcasses and raw prawns.
Authorities say the material, which has sparked a series of raids targeting businesses and individuals, could have resulted in enormous harm to Australia's biosecurity.
In all, 38 tonnes of hazardous material has been seized - enough to fill seven six-metre shipping containers.
The material also included pig meat, beef and plant roots covered in soil.
The haul was discovered after a biosecurity officer noticed suspicious boxes of goods during a routine inspection in NSW, the federal agriculture department said on Monday.
The department then executed a warrant at a western Sydney warehouse on February 17.
About 250 tonnes of goods were carefully examined with more than 38 tonnes deemed a biosecurity risk.
A few days later, Australian Federal Police helped execute other warrants at various locations across the state.
"A number of warrants have been executed in relation to individuals and businesses in relation to the investigation," the department said.
Farmers have reacted angrily to the bust and said more resources were needed to crack down on biosecurity breaches and defend Australia's food production.
"Smugglers seem to be treating our border controls like a lucky dip, hoping they can get away with it," NSW Farmers president Xavier Martin said.
Mr Martin said the huge haul which also included chicken and geese meat was likely "just the tip of the iceberg".
"The biosecurity officers who detected and seized these containers of material deserve to be praised for their efforts but it does point to a major problem with our biosecurity system," he said.
"The very fact that seven 22-foot shipping containers filled with illegal products slipped through our system is a big cause for concern," he said.
National Farmers president Fiona Simson echoed the concerns and the call for more funding.
"We're starting to see cracks appear in an increasingly complex biosecurity environment," she said.
"Increasing trade flows, diseases pressures in our region and climatic changes are just some of the factors putting pressure on our system."
Australia's Director of Biosecurity Andrew Metcalfe said anyone convicted of deliberately flouting biosecurity laws could be jailed for up to 10 years.
Individuals could be fined more than $1 million and companies almost $6.9 million.
"The secured goods could have posed an unacceptable risk of introducing disease and pests for plants and animals alike," Mr Metcalfe said.
The investigation is ongoing, with the department managing the seized imports.
