. 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 Northern Right-whale Dolphin Lissodelphis borealis Peale, 1848 Northern right-whale dolphins are gregarious animals, often assem- bling in herds of 1,000 animals or more (3,000 have been reported) and often mixing with other species. They do approach vessels and ride in the bow waves, but 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 Northern Right-whale Dolphin Lissodelphis borealis Peale, 1848 Northern right-whale dolphins are gregarious animals, often assem- bling in herds of 1,000 animals or more (3,000 have been reported) and often mixing with other species. They do approach vessels and ride in the bow waves, but tend to do so most frequently when accompanied by other dolphins. These handsome black and white dolphins reach lengths of about three meters and can swim 18 knots or faster for protracted periods. The right-whale dolphin, the only finless dolphin in the north- eastern Pacific, is sympatnc with the Pacific white-sided dolphin, probably occurring continuously across the temperate North Pacific but avoiding colder northern and warmer southern waters. It is known from about latitude 50°N to latitude 30 N and apparently moves farther south than 30 N only during periods of intrusion of unseasona- bly cold waters. Right-whale dolphins are present at all seasons seaward of the continental shelf off Central and Northern California, but they are found with greatest frequency within 25 nm of the coast of Northern and Central California in winter and in the SCB in winter. FIGURE 38. A fast-swimming group of northern right-whale dolphins off Point Conception. These sleek, finless dolphins can sustain speeds of at least 18 knots for protracted periods. (Photo by R. L. Pitman.) and spring. In those months northern right-whale dolphins are the second or third most abundant delphinid in the SCB, behind common and perhaps white-sided dolphin, and they may be met within a wide variety of locations. Right-whale dolphins are not usually found in waters warmer than 19 C and their movements overall a
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