A boat which lost one of its crew overboard is continuing a search using underwater equipment.
Two helicopters and 10 vessels took part in a full scale search after the man went missing in the North Sea at 0430 GMT on Saturday.
When darkness fell that search was called off, but the vessel the man was on, the DSND Pelican, has continued looking for him.
Aberdeen Coastguard said they remained very concerned for the man.
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It would be unrealistic not to acknowledge that his chances of survival are very slim
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The company the missing man works for said despite the lack of a sighting, the search would continue.
Robin Davies, Subsea 7's North Sea vice president, said: "Given the length of time our employee has been missing, together with the prevailing weather conditions, it would be unrealistic not to acknowledge that his chances of survival are very slim.
"However, we will continue to search. Our thoughts and prayers are very much with the missing person and his family at the moment."