. 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 In recent surveys off Central and Northern California (between Point Conception and Cape Mendicino) researchers located blue whales in all months from May through November in water 45 to about 2000 fathoms (x = 493 fathoms) deep, as singles and pairs and less frequently in groups of up to te
. 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 In recent surveys off Central and Northern California (between Point Conception and Cape Mendicino) researchers located blue whales in all months from May through November in water 45 to about 2000 fathoms (x = 493 fathoms) deep, as singles and pairs and less frequently in groups of up to ten. Some blue whales have been reported far off the Northern California coast in May; so, at least some of the species' movements in the area occur along pelagic routes. Some blue whales continue northward as far as the three major summering grounds-one in the eastern Gulf of Alaska, one south of the eastern Aleutian islands and one between the western Aleutians and Kamchatka. Catches of blue whales from British Columbia shore stations peaked in June and September, suggesting a northward movement past Vancouver Island in spring and a southward shift in autumn. Blue whales have been seen in Monterey Bay in recent years in September through December. Catches off San Francisco in the 1950s and 1960s occurred primarily in September and October and were presumed to be of whales migrating southward. Although most whales appear to have migrated through the SCB and arrived back on the southern grounds by October, several bits of information strongly suggest that the SCB is included in the blue whale's range year-round: a single sighting off San Clemente Island in December 1977; a report that in November 1985 there were four different groups of blue whales in the Santa Barbara Channel between Ventura and Anacapa Island; and the presence of whales elsewhere off Southern and Central California in November and December. This being the case, blue whale calves, usually born in autumn or winte
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