Dall's Porpoise

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Dall’s Porpoise

 

(Phocaenoides dalli), a mammal of the family Phocaenidae. The body is up to 2 m long. The teeth are very small, with up to 24 pairs in the upper jaw and up to 28 pairs in the lower. The coloration of the body is dark, with white sides and abdomen, and the edges of the caudal and dorsal fins are also white; on each side of the body is a large white field, or “wing,” hence its name in Russian of belokrylaia morskaia svin’ia (white-winged sea pig). The animal can move with great speed; it has a sharply enlarged heart and an increased volume of blood, as well as tall keels (upper and lower) on the caudal stem. The Dall’s porpoise lives in the northern half of the Pacific Ocean, to the north of California and Japan, and in the Sea of Okhotsk, the Sea of Japan, and the Bering Sea. It sometimes visits the Sea of Chukotsk. Its main food is cephalopods and also fish. The animals stay in small groups. They have no commercial significance.

REFERENCE

A. V. IABLOKOV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Killer Whales (Orcinuis orca) and Dall's Porpoises (Phocoenoides dalli), have distinct differences.
Although experienced observers can readily discern the profile differences between a surfacing harbor porpoise and a slow rolling Dali's porpoise (Phocoenoides dalli), accurate species identification can prove difficult for an inexperienced observer.
(2011), detected that bigger species of porpoises (Phocoenoides dalli, Phocoena dipotrica) generally show further development of cranial sutures than smaller species (Phocoena phocoena, P spinipinnis), also supporting the hypothesis of Barman et al.
Other marine mammals known to inhabit Cook Inlet, such as killer whales, Orcinus orca; Steller sea lions, harbor porpoise, Phocoena phoconea; and Dali's porpoise, Phocoenoides dalli, were not observed.
Risso's dolphin (Grampus griseus), Dall's porpoise (Phocoenoides dalli), Pacific white-sided dolphin (Lagenorhynchus obliquidens), gray whales (Eschrichtius robustus), blue whales (Balaenoptera musculus), minke (Balaenoptera acutorostrata), humpback (Megaptera novaeangliae) whales, fin whales (Balaenoptera physalus), northern right whale dolphins (Lissodelphis borealis) and killer whales (Orcinus orca) were sighted occasionally or during their migrations.
During 1998-2007, "450 harbor and Dall's porpoises (Phocoenoides dalli) and Pacific white-sided dolphins (Lagenorhynchus obliquidens) along the Pacific Northwest Coast were recovered and subjected to necropsy.
Prey species included Dall's porpoise Phocoenoides dalli, Pacific white-sided dolphins Lagenoryhncus obliquidens, harbor porpoise Phocoena phocoena, minke whales Balaenoptera acutorostrata, Steller sea lions Eumetopias jubatus and harbor seals Phoca vitulina.
Two other species that are present in the vicinity are the Dall's Porpoise (Phocoenoides dalli) and Pacific White-sided Dolphin (Lagenorhynchus obliquidens).