Crossbenchers who will determine Tasmania's government have ramped up their fight for greater salmon farming regulation amid claims of a fresh disease spike in pens.
More than 6300 tonnes of farmed salmon died during an outbreak of Piscirickettsia salmonis in the state's south over summer.
Independent MP Peter George claims Liberal Premier Jeremy Rockliff briefed him about a current "outbreak" of the same disease at a pen in the south.
The industry, however, denies a mass mortality event is occurring, while Minister for Primary Industries Gavin Pearce says the disease has "persisted" in salmon in the south over winter.
Mr George, fellow independents Craig Garland and Kristie Johnston, and Greens leader Rosalie Woodruff have called on both major parties to increase aquaculture oversight.
Tasmania's ongoing government is expected to be decided when parliament resumes on Tuesday, following a July 19 election that delivered another hung parliament.
Both the Liberals (14 seats) and Labor (10) finished short of the 18 seats required for majority.
Mr Rockliff has been recommissioned as premier but will face a no-confidence motion that could turf his government and install Labor leader Dean Winter as premier.
Both major parties have in recent weeks attempted to woo the cross bench, who are yet to decide which premiership option to back.
Labor's bid has in recent days hit a hurdle, with the party refusing to make policy concessions to the Greens.
Dr Woodruff said she planned to meet further with Mr Winter and had told Mr Rockliff environment laws need to be changed to ensure greater industry transparency.
"Now there is a strong progressive cross bench … we are confident we will get some changes in this area," she said on Friday.
Mr George and Mr Garland, who both campaigned heavily on an anti-salmon platform, were awaiting further correspondence from Mr Rockliff.
"As a fisherman, I am sick to death of my ocean being used as a dumping ground for effluent, sewerage and antibiotics," Mr Garland said.
"All we're asking is for proper regulation and oversight. Anyone who is going to put their hand up to form government, a marine plan is absolutely essential."
Mr Pearce said a range of options were being considered by industry to deal with Piscirickettsia salmonis, including vaccine development and adjusting production strategies.
Industry had advised it wishes to use an alternative antibiotic, Florfenicol, which hasn't been used in large quantities in Australia, he said.
"Our independent environmental protection authority and chief veterinary officer will play an important role in providing advice to government and to industry on its use," Mr Pearce said.
Industry body Salmon Tasmania said aquaculture companies had "stepped up" their response to the disease following the summer deaths.
Florfenicol requires lower doses than existing antibiotics, is absorbed more quickly and breaks down more quickly in the environment, it said.
