A right whale "grazes" by swimming slowly through swarms of small zooplankton (animal plankton) with its mouth open. Sei whales produce low-frequency, growl-like calls for communication. Large pods (50 or more sei whales) can be seen in areas that provide plenty of food. They also feed on small fish and squid. Life history: Sei whales reach sexual maturity by 10 years of age although adult size may not be attained until 25 years. I/daily ration"=;:0.11 (const. Introduction to Sei Whale. The local distribution is probably related to the location of the whale's food source, and sei whales are well known for their sudden "invasions" of an area to … In the eastern north Pacific, the reported take of sei whales by commercial whalers totaled 61,500 between 1947 and 1987. Blubber makes up 27% of a blue whale's body weight, 23% of a fin whale, 21% of a sei whale, 29% of a gray whale, and 36% to 45% of a right whale. Sei Whale Balaenoptera borealis. Sei Whales sometimes travel solo, while others group into pods of up to 6 members. After fin and blue whale populations were exhausted, Sei whales became the target of whalers in the 1950s and 1960s and the population was severely depleted. Natural enemies of sei whales are killer whales and humans. Binomial name: Balaenoptera borealis, René Primevère Lesson, 1828. The figures both amout of stomach contents and daily ration in sei whale lead to a considera­ Phytoplankton is a single celled plant that lives in the ocean. An average sei whale eats about 1,984 pounds of food each day, eating mostly small fish and other organisms. The other rorquals are: blue, fin, Bryde's and minke. Sei whales are relatively shallow divers, staying under from 5 to 15 minutes. Skimming the water for food while swimming, their short ventral pleats and bristle-packed baleen help them to collect as much delicious food as possible. This is believed to be one of the fastest of all whales, and it can easily travel several miles per day while migrating. Food habits: Sei whales skim-feed on schools of planktonic crustaceans (mainly copepods but also amphipods and euphausids). Starting in 1962, the number of sei whales targeted by whalers in B.C. The sei whale ( or ), Balaenoptera borealis, is a baleen whale, the fourth-largest rorqual after the blue whale, the fin whale and the humpback whale. Sei whales don’t gulp-feed like the other whales in their family. spiked to over 500 whales a year, after populations of blue and fin whales had been reduced by overharvesting. The krill is the primary consumer and the krill eats the phytoplankton. ), then average sized sei whale requires about 900 kg of food daily. Sei whale is solitary creature that occasionally travels in small groups (pods) composed of 2 to 3 (up to 6) animals. Method of Collecting and Eating Food. It inhabits most oceans and adjoining seas, and prefers deep offshore waters. Much accumulations of whales are usually expected in these seas during warm season. It is ranked #3 in terms of overall Baleen Whale size. The sei whales position in the food web would be a secondary consumer. Instead it stays near the surface of the water, swimming on its side through clouds of krill or other prey. Sei whale. Balaenopteridae is from a Danish word meaning "tubed" or "pleated" whale. Daily dietary intake for a sei whale is estimated at 1 ton. The sei belongs to the Balaenopteridae, or rorqual whales, that have numerous ventral grooves and a dorsal fin. FOOD AND FEEDING OF SEI WHALE 221 Pacific between 50°N and 60°N must be quite natural as well as the case of many other fisheries in that region. The sei is a baleen whale and they are usually divided into three families. Baleen whales, however, are … One of the Baleen Whale species is the Sei Whale. 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