Taxonomy
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Mammal
- Order
- Artiodactyla
- Family
- Balaenopteridae
- Genus
- Balaenoptera
Habitat
Sei whales primarily inhabit deep, offshore waters in temperate and subpolar regions, avoiding coastal areas and preferring the open ocean. They migrate seasonally, spending summers in high-latitude feeding grounds like the North Atlantic and Southern Ocean, and winters in warmer tropical waters for breeding. This pelagic lifestyle makes them less commonly seen near shorelines.
Diet
Sei whales mainly feed on krill, small schooling fish such as herring and sardines, and copepods, using their baleen to filter large volumes of water. They employ a lunge-feeding technique, swimming rapidly with mouths open to engulf prey. Feeding activity peaks in summer months when they are in nutrient-rich polar waters.
Behavior
Sei whales are typically solitary or found in small groups of 2-5 individuals, though they may form larger aggregations during feeding seasons. They are fast swimmers, capable of speeds up to 50 km/h, and undertake long annual migrations between feeding and breeding grounds. They exhibit surface behaviors like breaching and spyhopping, and communicate with low-frequency vocalizations.
Conservation Status
The IUCN classifies the Sei whale as Endangered, with global populations slowly recovering from the impacts of commercial whaling in the 20th century. Major threats include ship strikes, entanglement in fishing gear, and climate change affecting their prey availability.