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Rough Toothed Dolphin


Scientific Name:
Steno bredanensis
Length:
1.5 - 1.9 m (4.9 - 6.2 ft)
Weight:
30 - 45 kg (66 - 100 lbs)
Status:
good to go
Prey:
Fish (may be specialist mahi-mahi feeders) and squid

Physical characteristics

They are gray with shades of blue on the back and the sides with a paler underside.They do not have a dorsal fin, but a midline dorsal ridge.

Behavioral characterization

Very slow swimmers that roll to the surface and are rarely seen above the water surface. They only dive for up to 15 seconds.

Distribution

Shallow coastal marine waters around the northern rim of the Indian and western Pacific Oceans from the Arabian Gulf to the Indo-Malay region and to Java, Indonesia

Population size

150,000

Predators

Sharks and killer whales.

Migration/Dispersal patterns

Hawaii: frequent sightings indicate high side fidelity.

Social system/Group size

Usually seen in groups of 10 - 20. In the eastern tropical Pacific: mixed groups (pilot whales, Fraser's dolphin).

Major threats

Entanglement in fishing gear, pollution and overfishing.

Research efforts

N/A

Fun fact

The rough toothed dolphin is the smallest cetacean.