There was three crew onboard and they had finished fishing and were heading back to Milford. One of the crewmen was determined to be missing one hour after being last seen by the other two crew.
The fisherman, who was of Latvian origin, was not wearing a life jacket.
Milford Haven MRCC initiated a mayday relay broadcast to secure any assistance from other vessels that may be in the immediate area.
They called out Coastguard rescue teams from Dale and Broad Haven and requested the launch of Angle and St David's RNLI lifeboats and inshore lifeboat. A rescue helicopter was also requested.
A search has been undertaken today by these SAR units and fourteen other vessels of different types. The search has now been terminated.
Nigel Yelland, Watch Manager, Milford Haven, said:
An extensive search has been undertaken by many vessels in the hope of finding this missing fisherman. Unfortunately, he was not wearing a lifejacket, which could have aided in his survivability in this incident.