Divers and sonar equipment are being used to find a New Zealand fisherman and his Australian friend missing for more than a week off the coast of Tasmania.

The bodies of two of four men who set out for a day fishing nine days ago washed up on a Tasmanian beach a day after they were reported overdue.

Yesterday police used underwater sonar and divers to look for the two remaining men, including a 35-year-old New Zealander, who were part of the ill-fated trip.

Searchers have mounted an extensive sea, aerial and shoreline search off Tasmania where the men were believed to have got into difficulties.

There has been no sign of a 26-year-old man from Hobart and a 35-year-old New Zealander or their 5m fibreglass vessel.