The spotted dolphin is found worldwide in all temperate and tropical oceans. There are 2 species, the Atlantic spotted dolphin and the Pantropical spotted dolphin with 4 subspecies in the Pacific. Of those, 2 subspecies exist in the eastern Pacific ocean, a coastal variety with lots of spots and an oceanic form with fewer spots.
It is a small slender dolphin which grows to about 2-meter and weights about 100 kg. At birth, they are only about 70 cm long.
Pantropical Spotted Dolphin in Fiji, (Stenella attenuata)
Spotted dolphins in Fiji are quite common. They are often seen in very large pods outside the reefs but also occasionally entering lagoons.
Spotted dolphins are very active and playful, often they appear next to boats to bow ride or ride the wake, they jump high doing flips and multiple spins.
Spotted dolphins from large pods of hundreds of individuals, even superpods of several thousand animals.
They hunt in groups and feed on fish and squid. In the pacific, the spotted dolphin just like their cousin the spinner dolphins often follows tuna schools. They don’t usually feed on Tuna, but prey on the same epipelagic (light zone, 0-200m depth) fish as Tuna hunt. This behavior of swimming with tuna has decimated number considerable as they died as bycatch by the thousands in tuna purse seine fishing nets.
Today their numbers are recovering and they are one of the most common dolphins in the world.
The photos to the right show the use of a dart gun for the collection of a skin sample.
It is an air gun, that is used to shoot a small dart onto a whale or a dolphin. The hollow tipped dart bounces off the dolphin and in the process obtains some skin. The procedure is harmless to the dolphin.
During this research project in Lomaiviti, Central Fiji, skin samples from whales and dolphins were obtained for DNA analysis. This was the first scientifically documented presence of Pantropical Spotted Dolphins in Fiji waters. Anecdotally they are easily confused with the very commonly sighted spinner dolphins.