Sei whale (Balaenoptera borealis)
Group formation: Solitary (mother-calf pair, small groups 2-5)
Size: males 17 m, females 19.5 m, calf 4.5 m
Weight: 45 t, calf 1 t
Spout: 3-4 m, “bushy”
Age: 50-70 yrs
Sexual maturity: unknown ca 6-12 yrs
Gestation: 10-13 mths, with 2-3 yrs in between
Weaning: 6-9 months
Diet: small schooling fish, krill, copepods, and zooplankton
Distribution: Worldwide in all oceans, but rarely in polar or tropical waters
Chile: seen along the coast of Chile (feeding grounds in Aysen), not well known
Population size: unknown
Conservation Status: Endangered A1ad ver 3.1, Pop. trend: unknown
Threats: Vessel collisions, chemical and plastic pollution, man-made noise impacts (seismic surveys, military sonar), entanglement in fishing gear, over fishing