Fungie the dolphin has been a mainstay of Dingle harbour for almost 30 years, but boat trips to visit him could cease to operate "with immediate effect" if charges of up to €9,000 are imposed "in advance" of the season.
Currently operators in the Dingle Boatmen's Association pay around €2,500 to use the harbour at the end of each season.
Association chairman Jimmy Flannery called on anyone working in tourism in Ireland to make submissions to the public consultation before the deadline next Friday 20 April.
As previously reported on Afloat.ie, yacht owners are also up in arms over the new charges proposed by Marine Minister Simon Coveney that could see their rates hiked by an incredible 800 per cent.
And the news comes not long after fellow Kerry harbour users protested proposed new bylaws to regulate their activities and impose new charges.