Dall's Porpoise


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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

References in periodicals archive ?
Fauna ALLEN'S SWAMP MONKEY, BAIRD'S TAPIR, BRYDE'S WHALE, BURCHELL'S ZEBRA, COMMERSON'S DOLPHIN, COOPER'S HAWK, DALL'S PORPOISE, DARWIN'S FINCH/FROG/ SHEEP, DAVID'S SQUIRREL, DE BRAZZA'S MONKEY, DEMIDOFF'S BUSHBABY, DEVILLE'S TAMARIN, EVERETT'S TREE SHREW, FOWLER'S TOAD, GEOFFROY'S CAT, GOELDI'S MARMOSET, GRANT'S ZEBRA.
Two other species that are present in the vicinity are the Dall's Porpoise (Phocoenoides dalli) and Pacific White-sided Dolphin (Lagenorhynchus obliquidens).
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.
Group sizes for Pacific white-sided dolphins ranged from 4 to over 100 while Dall's porpoise group sizes ranged from 4 to 8.
Samples of Dall's porpoise, the most commonly harvested cetacean in Japan, had an average total mercury level of 1.
In past years, viewers have seen a variety of cetaceans, from gray, humpback, fin, sperm and killer whales to other species like Dall's porpoise and Pacific white-sided dolphins.
His call comes as animal welfare campaigners plan a demonstration in London in protest at Japanese whalers, who kill some 18,000 Dall's porpoise a year, according to the Environmental Investigation Agency.
The ship was not diverted if observers felt that group size and species could be determined from the transect line, as was frequently the case of nearby sightings of Dall's porpoise or large baleen whales.
As much as 30 percent of whale meat sold in Japan may in fact be mislabeled dolphin meat originating from Japanese fisheries like those at Futo Bay [Winter '96-97 EIJ] and the Dall's porpoise harpoon fishery on Japan's Sanriku Coast.
The most frequently encountered cetacean was the humpback whale (Megaptera novaeangliae; 834 sightings), followed by Dall's porpoise (Phocoenoides dalli; 521 sightings).
of Species sightings animals sightings animals Baleen whales Humpback whale 25 40 54 86 Gray whale 1 1 Minke whale 3 3 Unidentified whale 4 8 3 3 Odeontocetes Dall's porpoise 27 72 20 64 Harbor porpoise 4 10 11 20 Pacific white- sided dolphin 4 596 16 149 Northern right- whale dolphin Risso's dolphin 5 57 Killer whale 3 16 2 38 Unidentified delphinid 6 9 8 56 Pinnipeds and otters Harbor seal 2 2 3 3 Elephant seal 6 6 10 10 California sea lion Steller sea lion Northern fur seal 6 6 5 5 Sea otter Unidentified pinniped 4 4 3 3 Total sightings 94 772 141 495 1997 1998 No.