Authorities have scaled back their search for a kayaker missing off the far north Queensland coast.

A 29-year-old Japanese employee of the Fitzroy Island resort off Cairns got into difficulty on Sunday while kayaking with a colleague.

An extensive air and sea search has so far been unsuccessful.

Meanwhile, the search for a diver missing off the central Queensland coast resumed at first light this morning.

The 35-year-old man was reported missing at Swains Reef, about 185 kilometres south-east of Mackay, on Saturday afternoon.