Yom Kai Bao Fang, 37, was reported missing late Thursday night from the 685-foot Sao Paulo, a Hong Kong-flagged vessel en route to Mexico.
The search area is about 750 miles southwest of Alaska's Kodiak Island. Two Coast Guard helicopters covered a search area of 1,700 square miles. The Sao Paulo crew also retraced the ship's previous course.
Yom, a Chinese national, was last seen at 11:30 a.m. Thursday. He was discovered missing after he didn't report for his shift seven hours later and could not be found during a five-hour search of the ship.
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