Sei Whale

Page - May 31, 2007

Estimated Population: N/A endangered

Ways to identify this species:
slim and streamlined, bluish grey body with a white underside


  • Migratory, Sei whales feeds in arctic waters in the summer and subtropical waters during the winter where it remains mainly offshore
  • Sei whales are the third largest baleen whales. Adult males measure up to 55 feet and weigh up to 25 tons, females are usually a bit larger
  • They are one of the fastest swimming cetaceans and can reach speeds of 31 mph
  • An average Sei whale eats about 1,984 ounds of food each day, eating mostly small fish and other organisms


  • After fin and blue whale populations were exhausted, Sei whales became the target of whalers in the 1950's and 60's and the population was severely depleted
  • Today it still faces threats from hunting and entanglement in nets.