. The Canadian field-naturalist. 1991 Stacey and Baird: Status of the Pacific White-sided Dolphin 229 ⢠*.-â â â - - V. Figure 6. Pacific White-sided Dolphins racing alongside a Japanese fishing vessel. Photo by David Ambrose, National Marine Fisheries Service. taken off Japan in fisheries for dolphins and porpoises. Between 1979 and 1987 the number taken yearly off Japan has ranged from 2765 in 1984 to 37 in 1986, reflecting both direct and incidental catches (IWC 1986, 1988). More than 80 individuals were live-captured for display or research between 1966 and 1979 (Leatherwood et al. 1984).
. The Canadian field-naturalist. 1991 Stacey and Baird: Status of the Pacific White-sided Dolphin 229 ⢠*.-â â â - - V. Figure 6. Pacific White-sided Dolphins racing alongside a Japanese fishing vessel. Photo by David Ambrose, National Marine Fisheries Service. taken off Japan in fisheries for dolphins and porpoises. Between 1979 and 1987 the number taken yearly off Japan has ranged from 2765 in 1984 to 37 in 1986, reflecting both direct and incidental catches (IWC 1986, 1988). More than 80 individuals were live-captured for display or research between 1966 and 1979 (Leatherwood et al. 1984). Accidental hooking on fishing lines has been reported (Norris and Prescott 1961). Hoyt (1984) refers to predation on Pacific White- sided Dolphins by Killer Whales (Orcinus orca) in Nishiwaki and Handa (1958), but examination of that reference does not specifically indicate predation. However, Wells et al. (1980) list Killer Whales as predators; a likely occurrence as the range of the Pacific White-sided Dolphin in inshore waters overlaps with concentrations of transient Killer Whales, which feed primarily on marine mammals. We are not aware of any reports of predation by large sharks, but this may occur; shark predation on other species of dolphins has been reported (Wood et al. 1970; Ross and Bass 1971). Mass strandings of this species have not been reported in the literature, although mass strandings of the genus Lagenorhynchus are not uncommon (Sergeant 1982). Single strandings of individuals are most likely the result of pathologi- cal conditions. Cowan et al. (1986) describe pathologies from stranded animals, but the determination of the positive cause of death and the role of pathogens in mortality is difficult to ascertain. A variety of fungal, viral and bacterial disease agents have been reported from the Pacific White-sided Dolphin (Migaki et al. 1978; Dailey 1985). Parasites of the genus Nasitrema have been associated with brain lesions in an animal found disor
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