Humpback Whales are cosmopolites, living in all oceans around the world. The Humpbacks are baleen whales and spend most of the year in Artic Waters where they feed on krill and sardine-size fish.
During the polar winter month, they migrate to tropical and sub-tropical regions where they give birth to their young and mate.
The male humpback whales are known for complex whale songs which they repeat for many hours. Its purpose is not clear, but research suggests as though the whale songs are to attract whale cows which are ready to mate. The songs of the humpback whales are among the most complex types of acoustic communication in the animal kingdom. Singing can sometimes be heard when diving underwater.
Humpback whales are also famous for spectacular breaching and surface behavior, making them popular amongst whale-watching enthusiasts.
Humpback whales in the Fiji Islands
Humpback Whales sighted in Fiji belong to the Southern Humpback populations. The whales are seen in the Fiji Islands usually only during the winter season June to October when their seasonal migration takes them north, to warmer waters, where they give birth and mate. They may be encountered in the open ocean as well as in shallow lagoons and inside the reefs.
Whale watching for Humpbacks in the Fiji Islands is mainly opportunistic in nature. The sightings occur during boating or diving trips when time is spent out at sea. The population that breeds in Fiji has been intensively hunted and is only slowly recovering.
The neighboring Kingdom of Tonga has a number of well set up humpback whale watching operators. Tonga has quite a large and stable Humpback population which returns yearly to the Tonga archipelago for calving and mating.
Fiji’s NAI’A Liveaboard Dive Adventures visits Tonga yearly for Humpback Whale Watching Expeditions. During these tours, scientific data is collected. The trips are popular among insiders and are quickly booked out. Those that book early enough have the opportunity for spectacular encounters and even swims with Humpback whales.
Humpback whale research in Fiji
In 2003, the government declared the Fiji Islands economic zone a whale sanctuary. Since then there is an increase in whale research in the country. The Fiji Fisheries Department, the University of South Pacific, WDC, WCS all conducting Surveys and data is collected on the status of the humpback population that migrates yearly to Fiji.
To identify whales, ID photos of the whale flukes are taken. These have individual shapes and patterns which are used to tell individual whales apart. The photos are cataloged and the whales are named. During encounters, skin samples are taken and DNA is sequenced. With the help of genetics, the family trees of the different Southern humpbacks populations can be further understood.
All humpback whale ID’s taken in Fiji have not shown any match with any of the other known populations, i.e. from Tonga, Australia, etc… This suggests that different humpback populations do not really mix and or interbreed.