Scottish food producers have sent a letter warning UK Trade Secretary Liz Truss of how trade deals are being negotiated.
The 14 companies and trade bodies have exrewarded their concern over the free trade agreement being drawn up with Australia.
They say they are out of touch with the discussions which were "rushed ".
Mrs Truss insisted that UK farmers have nothing to do with fear and have "a lot to gain " from a deal with Australia.
She suggested that a 5% tariff on whiskey could be removed in the first drafted deal out of thin air since the UK left the EU.
In the letter, Scotland's leading groups of farmers, fishermen and processors said it There was no collaboration between Whitehall and industry.
They said the Christmas deal with the European Union left businesses facing at costly consequences, and they warned that could happen again when new deals are 'rushed' with Australia and then other major agricultural exporters.
Whitehall ministers sought to reassure producers that there will be safeguards and that new trade deals will open up opportunities to sell exports beyond Europe .
But critics of the proposed deal fear zero tariffs, the zero quota deal the Canberra government is demanding, would see UK farmers and businesses undermined by their Australian rivals .
'A bad precedent '
The food and drink industry in Scotland has suggested it couldset a bad precedent for future deals.
The letter, with signatories including the managing directors of National Farmers 'Union Scotland, the Scottish Seafood Association and Scotland Food & Drink, said: "We recognize the desire of the British government to act quickly to create a new opp ortunities with countries outside the EU.
"However, we are concerned that the pace of these negotiations, in particular Free Trade Agreement with Australia, is too swift and precludes proper review and consultation.
"Trade agreements are complex and markets are sensitive; the impact of the Brexit deal has demonstrated this.
"The risks here are enormous for the entire food and beverage supply chain and, in fact, In the absence of any formal impact assessment to suggest otherwise, we remain extremely concerned about the impact on sensitive areas of our industry. "
He added: "We welcome an ambitious trade policy if it will open new opportunities for our producers.
He said that the EU market remains the market of the most important export, with the destination ofs two thirds of all food exports.
Scotland Food & Drink Managing Director James Withers said: “As the food and agriculture industry we want to be ambitious for global trade . The future of our industry depends on it, and international sales of Scottish food and drink are already worth it. £ 6bn in a normal business year.
"However, if we rush trade deals, without any scrutiny and without any engagement with industry and others experts, we can harm UK businesses, communities, the environment and the UK's international reputation. "
'All voices are heard '
A spokesperson for the Department of International Trade said: "We are seeking a wide range of views before, during and after negotiations to ensure that all voices are heard, and to consult widely across the board.the country before launching talks, including deep engagement with Scotland, Wales and Northern Ireland.
"We will only sign agreements that work for all regions of the UK, including any potential deals with Australia.
"Our Exports Minister was in Scotland last week to defend the benefits of Australia's FTA, highlighting how a tariff cut would benefit iconic products like Scotch whiskey.
"Any deal we sign will include protections for the agricultural industry and will not undermine UK farmers or compromise our high standards . "