. The Canadian field-naturalist. 1993 Baird, Walters, and Stacey: Status of the Bottlenose Dolphin 475 Killer Whale tooth rakes on its side. Death related to food acquisition has been recorded in several cases, by blockage of air passages because of attempted ingestion of large prey (Hult et al. 1980), or from injuries from encounters with ray spines (Walsh et al. 1988). Mass strandings of Bottlenose Dolphins usually only comprise a small number of individuals at a time, and occur infrequently (Sergeant 1982). Special Significance of the Species The Bottlenose Dolphin is the most common cetace
. The Canadian field-naturalist. 1993 Baird, Walters, and Stacey: Status of the Bottlenose Dolphin 475 Killer Whale tooth rakes on its side. Death related to food acquisition has been recorded in several cases, by blockage of air passages because of attempted ingestion of large prey (Hult et al. 1980), or from injuries from encounters with ray spines (Walsh et al. 1988). Mass strandings of Bottlenose Dolphins usually only comprise a small number of individuals at a time, and occur infrequently (Sergeant 1982). Special Significance of the Species The Bottlenose Dolphin is the most common cetacean held in captivity for both public display and scientific research (Figure 4); they have been regu- larly kept in aquaria since 1914, and were first pub- licly displayed in Boston in 1861 (Leatherwood and Reeves 1982, 1983). Bottlenose Dolphins have been live-captured for display purposes around the world (Abel and Leatherwood 1985), and have been (or currently are) held in aquaria in several countries, including: Canada, England, France, Hong Kong, Indonesia, Israel, Japan, Netherlands, New Zealand, South Africa, Spain, and the United States (Defran and Pryor 1980). Some of these animals are taken from drive fisheries, and would otherwise be killed and used for human consumption (Abel and Leatherwood 1985). In recent years, swim-with-dol- phin programs in captivity have become very popu- lar; Linden (1989a) showed proceeds of $1 785 000 annually for four operations in Florida and Hawaii. The southeastern United States is the major area for live-capture operations (Bum et al. 1987). Hybridization in captivity has been documented with the Rough-toothed Dolphin, False Killer Whale, and Risso's Dolphin (Shallenberger and Kang 1977; Nishiwaki and Tobayama 1982; Shimura et al. 1986). Interestingly, Fraser (1940) reported possible hybrids with Risso's Dolphins in the wild off Ireland, and Herzing (1990) reported hybrids in the wild with Atlantic Spotted Dolphins off the Bahamas. Su
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