. Cetaceans of the Channel Islands National Marine Sanctuary. Cetacea; Mammals. SMALL CETACEANS (Less than 4 meters maximum length) This group includes most ot the cetaceans known commonlv as dolphins or porpoises. Ten such species are reported from waters in or near the CINMS. five as vear-round residents or retjular seasonal visitors and five as vagrants, extra-Iimital strays or rarely occurring individuals difficult to detect or positively identify. Residents and Common Migrants. Dall's Porpoise Phocatmiics dalli (True, 1885I In the northern North Pacific Ocean, the endemic Dall's porpoise
. Cetaceans of the Channel Islands National Marine Sanctuary. Cetacea; Mammals. SMALL CETACEANS (Less than 4 meters maximum length) This group includes most ot the cetaceans known commonlv as dolphins or porpoises. Ten such species are reported from waters in or near the CINMS. five as vear-round residents or retjular seasonal visitors and five as vagrants, extra-Iimital strays or rarely occurring individuals difficult to detect or positively identify. Residents and Common Migrants. Dall's Porpoise Phocatmiics dalli (True, 1885I In the northern North Pacific Ocean, the endemic Dall's porpoise is the most frequently encountered and probably the most abundant small cetacean. It is distributed widely m cool temperate to subpolar waters, from the latitudes of central Baja California on the east and southern Japan on the west, north to the central Bering Sea, including the eastern Sea of Japan, the sea ot Okhotsk, the Gult ot Alaska, and inland marine waters of Washington, British Columbia and Alaska. The current population has been estimated at between and ; million animals, although a more conservative minimum estimate of 580,000 recently reported apparently accounts tor biases m data used to derive the tormer estimates. The only direct commercial harvest ot Dall's porpoises is a traditional coastal harpoon fishery in Japan which accounts tor annual harvests of about 6,000 animals. This species is, however killed incidentally m the Japanese high seas and land-based drift net fisheries for salmon, which have operated in the North Pacific and Bering Sea since 1952. Although most of this incidental mortality occurs in the western half of the North Pacific, some occurs in the United States' waters of the eastern North Pacific. Accurate data on mortality are unavailable, but estimates indicate that benveen 2,250 and 20,000 porpoise have been entangled in gill nets and drowned annually during years of greatest fishing effort. TTiese figures are alarming to conservati
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Keywords: ., bookcentury1900, bookcoll, booksubjectcetacea, booksubjectmammals
