Arctocephalinae (fur‑seal subfamily) within Otariidae includes the Southern HemisphereArctocephalus and the Northern Fur Seal Callorhinus ursinus. Otariids bear external ear pinnae, swim with foreflipper propulsion and can walk on land. Fur seals have dense underfur that fuelled historic exploitation.
Ecology & Behaviour
Feeds on pelagic fishes/cephalopods near shelf breaks, upwellings and seamounts. Breeds at island rookeries with strongsexual dimorphism and polygyny; females alternate foraging trips with pup nursing.
Identification
Males much larger; powerful shoulders and large foreflippers; coat of guard hairs plus dense underfur. On land, quadrupedal gait.
Distribution & Taxa
Arctocephalus: widespread in the Southern Hemisphere (S America–sub‑Antarctic–Australia/NZ–S Africa).
Callorhinus ursinus: Northern Fur Seal across the North Pacific (Bering Sea–Aleutians–Kurils–N Japan).
Threats & Conservation
Legacy of the fur trade for some stocks.
Bycatch/entanglement (longlines, gillnets, ghost gear).
Food‑web shifts (fisheries pressure, El Niño/marine heatwaves).
Pollutants/disease (POPs, algal toxins, pathogens).
Disturbance (tourism near rookeries, vessel noise/strikes).
Priorities: spatio‑temporal protection of key rookeries/upwelling hotspots, anti‑entanglement gear, debris reduction, health monitoring, and climate‑responsive management.
