June Mummery branded the deal a disaster (Image: Unlocked UK)
Additional customs and paperwork delays meant it was currently taking up to 39 hours to get products to market - up from 22 prior to the Brexit deal coming into effect in January.
Ms Fordyce warned the UK risked being usurped by competitors as a result of the reputational damage being done to the country s fresh products.
She added: There are other countries waiting to take up these contracts - the Norwegians are all over the salmon. These will be long-term losses.
The Prime Minister, who previously said his Brexit deal would be very beneficial in the medium to long term for fishermen, reportedly wants Britons to eat more of the fish caught domestically, with most currently exported.
Fishing firms could go bust over Brexit, MPs told bbc.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from bbc.co.uk Daily Mail and Mail on Sunday newspapers.