Threats to sperm whale
Sperm whale being cut up at whaling
station, 1975. Sperm whales were
one of the most heavily exploited
of all the world's whales
Killer whales have been seen attacking sperm whales, but usually unsuccessfully. Pilot whales are also known to harass them. Other potential predators of younger animals include large sharks. When confronted with predators individuals are known to cluster together into defensive formations.
Human impact
These whales were one of the most heavily exploited of all the world's whales, although they are still relatively abundant. Present day threats include entanglement in fishing gear and collision with ships. Studies on the effects of tourism on sperm whales have found them to react negatively to rapid approaches by vessels, sudden changes in speed and close approaches (MacGibbon, 1991). Whales respond by spending less time at the surface, and so tourism has an impact on their normal behaviour.
Contacts
To report whale or dolphin sightings or strandings phone the DOC HOTline 24 hour emergency number:
0800 DOC HOTline (0800 362 468)