. Cetaceans of the Channel Islands National Marine Sanctuary / prepared for National Oceanic and Atmospheric Administration, Channel Islands National Marine Sanctuary and NOAA, National Marine Fisheries Service by Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Whales California Channel The harbor porpoise, Pbocoena pbocoena (Linnaeus, 1758) on the other hand, is a shallow water inhabitant usually restricted to waters less than 50 fms and almost always to water less than 100 hns deep. They are a cold temperate/subarctic species whose normal range is well north of Point Conc
. Cetaceans of the Channel Islands National Marine Sanctuary / prepared for National Oceanic and Atmospheric Administration, Channel Islands National Marine Sanctuary and NOAA, National Marine Fisheries Service by Stephen Leatherwood, Brent S. Stewart, Pieter A. Folkens. Whales California Channel The harbor porpoise, Pbocoena pbocoena (Linnaeus, 1758) on the other hand, is a shallow water inhabitant usually restricted to waters less than 50 fms and almost always to water less than 100 hns deep. They are a cold temperate/subarctic species whose normal range is well north of Point Conception. They have been only rarely reported from south of the point (strandings in Los Angeles, Santa Barbara and Ventura). No live harbor porpoises have been reported from south of Morro Bay. With such short distances between the SCB and the southern portions of the species' range, however, it might be speculated that if the population grows and a period of cooling of the ocean occurs in the SCB then harbor porpoises may venture southward, in a reversal of the trend exhibited recently by bottlenose dolphins which have moved north of Point Conception during periods of warming. At present, however, populations of harbor porpoises are depressed. The species is victimized by gill nets set in the coastal waters for a variety of fishes. In 1983, alone, an estimated 300 harbor porpoises were killed in such fisheries. With this impact the future of an already small population off California is in jeopardy. FIGURE 46. A harbor porpoise off Seaside, California in 1973 (top) and stranded near San Francisco (bottom). This species has never been reported alive in the SCB but is represented here by at least three strandings. (Photo by J. D. Hall, top; and M. Webber, bottom.). 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 work
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