Population and Distribution
The distribution and population of the Rough-toothed Dolphin is poorly understood. They inhabit the Pacific, Atlantic, and Indian Oceans, and in the Mediterranean Sea, in warm temperate to tropical waters, with occasional reports from cooler environments. Live sightings are almost universally made far off-shore, beyond the continental shelf, in water at least 1 kilometre (0.62 mi) deep.
Most of the research activity concerning the dolphin has been directed in the eastern Pacific, where a population estimate of 150,000 has been obtained. Fossils belonging to the genus Steno are known from Europe and date to the early to mid Pliocene.
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