A word from Ocean Alliance CEO Iain Kerr about one of his favorite subjects–sperm whales, and their sounds:
We will often acoustically track sperm whales through the night in fair weather or foul in the hope that we’ll be with the whales when the sun rises and can spend the whole day working with them. When they do go quiet, it’s often in the one or two hours before dawn, and if we can’t hear them we can’t track them. Nothing is more frustrating than tracking them all night and then losing them in the hour before the sun rises. You don’t want to be the one on that watch.
This recording was made by Odyssey crew member Rik Walker on a good day in the Gulf of Mexico during Operation Toxic Gulf 2013:
All whales make sounds. The toothed whales tend to make sounds for echolocation purposes and it is now thought that many of the baleen whales do as well. Humpback whales are best known for their long complex often haunting sounds. The largest toothed predator on this planet is the sperm whale and this is a species Ocean Alliance has studied all over the world. Their position at the top of the oceans’ food web makes them a great bio-indicator for the health of the oceans. Sperm whales are relatively easy to track using a line of towed underwtater microphones (hydrophones). The arrival time of sounds at the different hydrophones can give us a bearing and often a range to the animal. In this particular recording there is one primary whale and at least two or three others in the background. Our belief is that these sounds are likely the animal searching and zeroing in on prey. As I listen to these sounds I can’t but wonder what is going on in the abyss.