Marine Mammal Science & Conservation

Commerson’s dolphin

Commerson’s dolphin (Cephalorhynchus commersonii)

Group formation: Social groups 1-10

Size: 1.5-1.7 m, calf 1 m

Weight: 45-86 kg, calf 5.5 kg

Age: 20 yrs

Sexual maturity: 5-9yrs

Gestation: 12 mths

Weaning: unknown

Diet: opportunistic coastal feeders, mostly mysid shrimp, fish, squid, algae, isopods and other benthic invertebrates

Predators: sharks, killer whales

Distribution: two populations, one in Argentina / in the Strait of Magellan / near the Falkland Islands and a second lives near the Kerguelen Islands

Chile: we have seen them inside the fjords of Aysen with a group of Chilean dolphins (first record of this species in Aysen)

Population size: unknown

Conservation Status: Data Deficient ver 3.1, Pop. trend: unknown

Threats: Illegal catches for bait and consumption (Peru, Ecuador, Chile), chemical and plastic pollution, man-made noise impacts (seismic surveys, military sonar), entanglement in fishing gear, bycatch, over fishing, captivity