Croatian owner Uljanik Plovidba's banks have walked away from refinancing talks and arrested one of its tankers, prompting the company to file for "pre-bankruptcy" proceedings.

The syndicate of international lenders, led by Credit Suisse, made the move "without any prior notice", the tanker and bulker operator said.

Talks had been ongoing with Uljanik, but the "unilateral" decision by the banks allowed them to arrest the 53,000-dwt Pomer (built 2011) to secure the outstanding debt, the owner added.