The researchers from the universities of Moscow and Saint Petersburg first spotted the orca's towering, two-metre (about six feet) dorsal fin break the surface near the Commander Islands in the North Pacific in August 2010.
Living in a pod with 12 other family members, Iceberg was deemed to be at least 16 years old, given the size of his dorsal fin, said Erich Hoyt, co-director of the Far East Russia Orca Project (FEROP).
"This is the first time we have ever seen an all-white, mature male orca," Hoyt told AFP. "It is a breathtakingly beautiful animal."
The scientists decided to hold back on releasing photographs of Iceberg until they were able to study him further, "but we have been looking for him ever since," said Hoyt.
Orcas can travel thousands of miles.
The scientists would like to establish whether Iceberg is albino -- a genetic condition that leaves animals unable to produce melanin, a dark pigment of skin, hair and the eye's retina and iris.
Many albino animals never grow into adulthood. Their visibility is a disadvantage in the hunt for food and protection against predators.
Two other white orcas are known to live in the waters where Iceberg was spotted, east of Kamtchatka peninsula in Russia's far-east, but they are juveniles.
Read more at Discovery News
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