. Bulletin. Science; Natural history; Natural history. CATALINA ISLAND MARINE MAMMALS 21 Table 7. Mean water depth (in meters) in which six species of cetaceans were seen at Catalina Island, CA, in 1983-91. No water depth data are available for the other cetaceans sighted. (N = number of sightings with depth recorded.) Species Mean Std N Common dolphin 10 Pacific white-sided dolphin 25 Bottlenose dolphin 86 Gray whale 82 Risso's dolphin 22 Pilot whale 27 Direction of travel: gray whales.—Gray whales were observed en route to
. Bulletin. Science; Natural history; Natural history. CATALINA ISLAND MARINE MAMMALS 21 Table 7. Mean water depth (in meters) in which six species of cetaceans were seen at Catalina Island, CA, in 1983-91. No water depth data are available for the other cetaceans sighted. (N = number of sightings with depth recorded.) Species Mean Std N Common dolphin 10 Pacific white-sided dolphin 25 Bottlenose dolphin 86 Gray whale 82 Risso's dolphin 22 Pilot whale 27 Direction of travel: gray whales.—Gray whales were observed en route to and from Mexican waters during their annual migration. Generally, whales moved southward before 15 February and northward after that. For instance, during the three long seasons, 100% (1983), 91% (1983-4) and 97% (1984-5) of the gray. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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