An Aran Islands ferry company is currently battling the Department of the Marine in the High Court over charges for the use of Rossaveal Harbour, the Galway Advertiser reports.
Island Ferries Teoranta claims that harbour fees have risen eight-fold since 2003, saying they are "unreasonable, discriminatory and unrelated to the cost of running the harbour".
The company, run by Paddy O'Brien and family, said it received a bill of more than €200,000 in mid-2005, compared to annual bills of around €23,000 in previous years, and claims that one of its vessels was wrongfully detained when it refused to pay.
Irish Ferries has also accused the Government of breaking EU competition law over its monopoly on the provision of harbour facilities.
The High Court hearings continue.