Killer whales in Hawai‘i

Breaking news! (October 14, 2016)

The first ever long-term (>1 week) re-sighting of a killer whale from Hawaiian waters was just made, by comparing video footage of a group of killer whales taken off Moloka‘i by Tabitha Pupuhi on October 10, 2016, to photos taken off Kona in July 2016, both by the Pacific Island Fisheries Science Center and during our July field project! Our photo-identification catalog currently contains 44 individuals, now with just one re-sighting. The July 2016 group was satellite tagged by the Pacific Island Fisheries Science Center and moved far north of the islands, and we tagged a different group in November 2013 that moved far to the west. Together, the photo and satellite tag data suggest that killer whales in Hawaiian waters are part of a large population that broadly ranges over a wide part of the central tropical Pacific. However, the October 2016 re-sighting shows that the whales do loop back through the area, at least on occasion. We are hoping that more photos taken by ocean users in Hawai‘i will continue to help us understand this visitor to the islands!

A killer whale off the island of Hawai‘i, November 1, 2013. Photo (c) Robin W. Baird

Killer whales are found world-wide, and are one of the most well-known species of whale in the world. In Hawaiian waters they are rare, to say the least. In a 2002 National Marine Fisheries Service survey of the entire Hawaiian Exclusive Economic Zone, extending 200 nautical miles (370 km) offshore of all the islands, including the Northwestern Hawaiian Islands, there were only two on-effort sightings of killer whales, and the resultant estimate of abundance in the entire area was only of 349 individuals (Barlow 2006). In our work, between 2000 and July 2016, covering over 100,000 km of trackline, we've only seen killer whales on four occasions, off Hawai‘i Island in May 2003, off Kaua‘i in July 2011, off Hawai‘i Island in November 2013 and again in July 2016. In each case we were able to photo-identify the individuals present, four or five in each encounter, but none of the individuals matched between encounters. We have a small photo-identification catalog of this species in Hawaiian waters, but have found no matches (but see the Breaking News above!), suggesting the individuals encountered around the islands are part of a larger open-ocean population.

In 2006 we published a compilation of 21 records of killer whales in Hawaiian waters from 1994 through 2004 (a copy can be downloaded here). From those records killer whales had been recorded during nine months of the year. Since then they've been recorded in two additional months (June and October), so the only month of the year they've not been recorded in Hawaiian waters is December.

Although there were more records during the humpback whale season, there are also more people on the water working with whales during that time of the year, so they don't necessarily use Hawaiian waters more when humpback whales are around. Since that publication there have been a number of additional sighting records, and one stranding, of killer whales around the main Hawaiian Islands, but these records likely reflect more people on the water and more communication among those who see the whales than any actual increase in the number of killer whales using the main Hawaiian Islands.

An adult male off the island of Hawai‘i, June 9, 2009. Photo (c) Masa Usioda/Coolwaterphoto.com

There is no evidence of a "resident" population of killer whales in Hawai‘i - whales seen around the main Hawaiian Islands are likely part of a wide-ranging population that inhabits the central Pacific. There are some physical differences from killer whales seen in Hawai‘i compared to the well-known populations along the west coast of North America. The saddle patch (the gray area below and behind the dorsal fin) is very narrow in killer whales in Hawai‘i, and also not very bright (i.e., difficult to see except in ideal light conditions).

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