ription

Atlantic spotted dolphins reach a maximum adult length of 7.5, perhaps 8
feet (2.3 to 2.4 m). They are generally more robust in body shape than
the other species of Stenella, closely resembling Atlantic bottlenosed
dolphins in that regard, though the Atlantic spotted dolphins tend to be
more slender.

The dorsal fin is distinctly back-curved and pointed on the tip, also
closely resembling that of the Atlantic bottlenosed dolphin.

As the common name suggests, the Atlantic spotted dolphins are marked
dorsally with numerous grayish-white spots on a darker background and
ventrally with dark spots on a lighter background, though the extent of
the spotting and the additional details of coloration change with age.

Immature animals lack spots completely. They are dark gray or purplish
gray on the back, becoming lighter gray on the sides and white on the
belly. The cape along the back is distinctly separated from the lighter
gray coloration of the sides. The flippers and the trailing edge of the
flukes are darker than the rest of the body.

As they age, the Atlantic spotted dolphins develop grayish-white spots,
first low on the sides, spreading upward. During this stage, the cape
becomes less distinct, and dark spotting begins to develop on the belly,
the spots increasing in number with increasing age. In adult animals,
the belly is often extensively covered with dark blotches but never
becomes completely black. The lips may be white, and the beak is
characteristically tipped with white, a feature which may aid in
identification at sea.

The Atlantic spotted dolphins have a spinal blaze and a light line which
extends from the flipper to the eye.

Natural History Notes

Little is known of the natural history of the Atlantic spotted dolphins.
The species occurs in herds of up to several hundred individuals,
though groups of 50 or fewer (6-10) are more common. They are often seen
jumping clear of the water and habitually ride the bow wave of moving
vessels. As they do, the distinct cape or band of purplish gray on the
back of younger animals and the spotting pattern of older animals may be
visible.

Atlantic spotted dolphins feed primarily on squid but may also take
carangid fishes, small eels, herring, or anchovies.

May Be confused With

Atlantic spotted dolphins, particularly young animals, may be easily
confused with Atlantic bottlenosed dolphins because of the similarities
in color pattern and gene