The exact number of Humpback whales that visit Hawaii every year is unknown, but marine biologists have speculated that an even number of whales make up each stock. Some speculate that 1/3 of the total population of North Pacific Humpback Whales arrive in Hawaii every year, others stating that it could be 1/2 of the total population. But, it is also a fact that the majority of Humpback calves born each year are also born in Hawaii. With all of that information in mind, biologists overall believe that concerning stock populations migrational locations, Humpback Whale presence in Hawaii is the largest. Although each stock is distinct in migration habits, there is an intermixing of stocks, which happens in Alaskan waters during the Summer months.
Due to the efforts of North Pacific Humpback Whale conservation, the whale population has been steadily increasing over the past 50 years. In 1966, the North Pacific Humpback Whale population was believed to be approximately 1,400. In 1993, marine conservationists estimated 6,000, and in 2014, the population of North Pacific Humpback Whales is believed to be 21,000.