Geography. Presently, the animal is threatened by pollutants and different contaminants in its marine habitat, found in the blubber of Dall’s porpoise. To understand the health of marine mammal populations, scientists study unusual mortality events. They can be found in offshore, inshore, and nearshore oceanic waters, between 30° North and 62° North. , an unusual mortality event (UME) is defined as "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response." Learn who you should contact when you encounter a stranded or injured marine animal >. Furthermore, Dall’s porpoises are often incidentally caught in fishing gears, catching groundfish, salmon, and squid in the waters of Canada, Russia, Japan and U.S. (including Alaska). Dall's porpoises are known to migrate, travelling north in summer and moving to south by winter. Numerous organizations around the country are trained and ready to respond. Habitat. Dall’s Porpoise Distribution, Habitat, and Ecology. Dall's porpoise in Alaska. Observe all dolphins and porpoises from a safe distance of at least 50 yards and limit your time spent observing to 30 minutes or less. They are very active and incredibly fast - reaching swimming speeds of 34 miles per hour (54 km/h). 2. One of the main threats to Dall’s porpoises is becoming entangled or captured in commercial fishing gear such as drift nets, gillnets, and trawls. Dive times are short at 2-4 minutes. Dall’s porpoise is the largest of all porpoises. In the late 20th century, the only small cetaceans you were likely to see in the Puget Sound were Dall's porpoise. World map providing approximate representation of the dall porpoise's range. When preying, these whales are able to dive at a depth of up to 1640 feet (500 m). Ocean noise, Alaska, A Dall’s porpoise normally eats as much as 3 - 12 kg (7 - 28 pounds) of food every day. Monitoring population abundance and distribution. They can be found in The current population estimate for Dall’s porpoise is more than one million animals.. Dall’s porpoises are larger than other porpoise … They have been sighted as far south as Scammon’s Lagoon in Baja California when water temperature was unseasonably cold. This hotline is available 24 hours a day, 7 days a week for anyone in the United States. Males of this species mate with multiple females during their life. The snout of the animal is blunt and the flippers are small. In the western North Pacific Ocean, there are an estimated 104,000 Dall’s porpoises off of Japan, 554,000 in the Okhotsk Sea, 100,000 in the U.S. West Coast stock, and 83,000 in Alaska. Once entangled, porpoises can become anchored or may swim off with the gear attached for long distances, ultimately resulting in fatigue, compromised feeding ability, or severe injury, which may lead to reduced reproductive success and death. The Dall's porpoise is easily identified by it's very unique black and white markings and is named for the naturalist who first discovered them, W.H. Their habitat ranges from the coasts of California and Northern Alaska through Japanese waters and into the Bering Sea. Photo: NOAA Fisheries/Marilyn Dahlheim. Call the NOAA Fisheries Enforcement Hotline at (800) 853-1964 to report a federal marine resource violation. Dall’s porpoises, like all marine mammals, are protected under the Marine Mammal Protection Act. Targeted management actions taken to protect these animals include: Overseeing marine mammal health and stranding response. The most common way to identify them is by the large white flank on the stomachs. Dall’s porpoises have small, robust bodies and triangular heads. Accumulating and passing through the marine food web, these contaminants have negative affect on reproduction, being an important toxicity concern. For the best experience, please use a modern browser such as Chrome, Firefox, or Edge. They briskly surface while swimming, creating a "rooster tail" of water spray that is a unique characteristic of the species. They are named for W.H. Dall’s porpoises can dive up to 1,640 feet to feed on small schooling fish (e.g., anchovies, herring, and hake), mid- and deep-water fish (e.g., myctophids and smelts), cephalopods (e.g., squid and octopus), and occasionally crustaceans (e.g., crabs and shrimp). 2002). However, there have been reported concentrations of more than 200 individuals. Dall's Porpoise (Phocoenoides dalli) Habitat Cool temperate waters of the continental shelf and slope, and open ocean Range Across the North Pacific Ocean and in adjacent seas Eats Diet in primarily squid and other cephalopods, and small schooling fish such as herring, pilchards, lanternfish, jack mackerel, sardines and … More precisely, this range extends from the Sea of Japan to the coast of California, in the United States, and to the Bering Sea. They are very active and incredibly fast - reaching swimming speeds of 34 miles per hour (54 km/h). This species is commonly found in the Gulf of Alaska, Bering Sea, Okhotsk Sea, and Sea of Japan. Dall's Porpoise in Prince William Sound, Alaska. Dall's porpoise inhabits offshore, inshore, and nearshore waters of North Pacific Ocean, including the Bering Sea, Sea of Japan as well as Okhotsk Sea. Dall, an American naturalist who collected the first specimen of this species. Copper River Delta Carcass Surveys: Annual Reports, Acoustic Studies Sound Board of Marine Mammals in Alaska, NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION, Report a Stranded or Injured Marine Animal, Learn more about our conservation efforts, NOAA Office of Law Enforcement field office, Incidental Take Authorization: Lamont-Doherty Earth Observatory Marine Geophysical Survey in the Aleutian Islands, Finding of No Significant Impact (pdf, 14 pages), Incidental Take Authorization: Washington Department of Transportation Seattle Multimodal Project, Seattle, Washington (Season 4- 2020), Marine Mammal Monitoring Plan (pdf, 11 pages), Incidental Take Authorization: Washington Department of Transportation Mukilteo Multimodal Project, Puget Sound, Washington (Season 4- 2020), Incidental Take Authorization: Sentinel Island Moorage Float Project, Juneau, Alaska. This research is especially important in maintaining stable populations.   …, NOAA Fisheries has issued an IHA to the Washington State Department of Transportation (WSDKT) to incidentally harass, by Level A and Level B harassment, marine mammals during construction associated to Seattle Multimodal Project at Colman Dock in…, NOAA Fisheries has issued an IHA to the Washington State Department of Transportation to incidentally harass, by Level A and Level B harassment, marine mammals during pile driving and pile removal activities associated with the Mukilteo Multimodal…, NOAA Fisheries has received a request from the Gastineau Channel Historical Society (GCHS) for the re-issuance of a previously issued incidental harassment authorization (IHA) with the only change being effective dates. The Dall’s Porpoise has a small head with a narrow mouth and small flippers. The stocky body is dark gray to black, covered with white spots and exhibiting white markings on the tail and dorsal fin. Adult males have a thicker tail stock and forward-projecting dorsal fin. These animals usually gather in small groups, consisting of 10 - 20 porpoises. They are commonly seen in inshore waters of Washington, British Columbia, and Alaska. Dall's porpoises occur throughout the coastal and pelagic waters of the North Pacific Ocean. You may also contact your closest NOAA Office of Law Enforcement field office during regular business hours. Dall's porpoise are found only in the North Pacific, ranging from Baja California north to Alaska and the Bering Sea and across into Japanese waters, seemingly confined to colder waters with temperatures of less than 60 degrees F (15 C). The calves are generally 3.3 feet long and are nursed by their mother for less than one year. In spite of their stocky body, they are a relatively small porpoise that average only 1.8 m in length for males with a … The ideal habitat for Dall's porpoise is temperate to "boreal" waters with more than 600 feet (180 m) of depth and with temperatures, varying from 36°F (2°C) to 63°F (17°C). Lactation lasts two to four months and Dall's porpoise usually have calves every three years. Habitat alteration, coast, particularly where there are deep underwater channels and canyons. Underwater noise pollution interrupts the normal behavior of Dall’s porpoises and interferes with their communication. Dall’s porpoises are usually found in groups averaging between two and 12 individuals, but they have been occasionally seen in larger, loosely associated groups in the hundreds or even thousands of animals. Their range is from Japan, around the north Pacific Rim, to Baja California. Dall’s porpoises are only found in the North Pacific, because they prefer waters whose temperature ranges between 15 degrees Celsius (59 degrees Fahrenheit) and 2 degrees Celsius (35 degrees Fahrenheit). They have a forward tilted dorsal fin that has a small white trim. Hybrids tend to appear more similar to Dall’s porpoise in body shape, diving characteristics and behaviour, but they lack the white side patches … Harbour porpoise are represented in red and Dalls porpoise are represented in black. These pollutants can harm their immune and reproductive systems. Dall's porpoise in Alaska. Dall's Porpoise Range Species Fact: Dall's porpoises are considered the fastest swimmers among small cetaceans, capable of reaching speeds up … The results of this research are used to inform management decisions for this species. Educating the public about Dall’s porpoises and the threats they face. In Japan, particularly, the animals are caught by whalers for their meat. In 2016, we issued technical guidance for assessing the effects of anthropogenic sound on marine mammal hearing. NOAA Fisheries is working to conserve this species in many ways, with the goal that its population will remain stable. Dall’s porpoises resemble orcas because of their black bodies and white underbellies, but are much smaller. Clicking in a Killer Whale Habitat: Narrow-Band, High-Frequency Biosonar Clicks of Harbour Porpoise (Phocoena phocoena) and Dall’s Porpoise (Phocoenoides dalli) May 2013 PLoS ONE 8(5):e63763 As opposed to dolphins, these animals are rarely seen leaping from the water. There are insufficient data available on current population trends for both stocks, but Dall's porpoises are considered reasonably abundant. In the eastern North Pacific Ocean, they can be found from around the U.S./Mexico border (Baja California, 32° North) to the Bering Sea, in the central North Pacific Ocean (above 41° North), and in the western North Pacific from central Japan (35° North) to the Okhotsk Sea. Â. Dall’s porpoises prefer temperate to boreal (northern, cold) waters that are more than 600 feet deep and with temperatures between 36° Fahrenheit and 63° Fahrenheit. Being night feeders, they use echolocation to hunt prey, navigate in the ocean and, likely, to communicate with each other. Currently, Dall’s porpoises are classified as Least Concern (LC) on the IUCN Red List. As rapid, social swimmers, Dall’s porpoises are also attracted to fast moving vessels and commonly bowride beside ships. Hunting, They have 38 to 56 very small, spade-shaped teeth (about the size of a piece of grain or rice) on each jaw that are useful for grasping. Pollutants and various contaminants in the marine environment have been found in the blubber of Dall's porpoises. Dall's porpoise are often seen playing in the bow wake of whale watching glacier cruise boats in Kenai Fjords and are known to reach speeds of close to 35 miles per hour, named after W.H. Sound pollution threatens Dall’s porpoise populations by interrupting their normal behavior and driving them away from areas important to their survival. Dall’s porpoises are considered the fastest swimmers among small cetaceans. Learn more about the Marine Mammal Health and Stranding Response Program. Clicking in a Killer Whale Habitat: Narrow-Band, High-Frequency Biosonar Clicks of Harbour Porpoise (Phocoena phocoena) and Dall’s Porpoise (Phocoenoides Dall. Dall’s porpoise (Phocoenoides dalli) Puget Sound dolphin and porpoise species identification video. Their diet consists of lanternfish, Pacific hake, jack mackerel, herring, sardines, crustaceans and cephalopods, including squid. Cooler, open waters are preferred by this species. Dall’s porpoises are named for W.H. Continents. Dall’s porpoise … If you are in a boat, chances are they will find you. In the Bering Sea, Dall’s porpoises occur in higher abundance near the shelf break. The truei-type is abundant only in waters around the Kuril Islands and off the Pacific coast of northern Japan, while the dalli-type ranges across the northern North Pacific—from northern Japan to the Bering Sea and into California. Report a sick, injured, entangled, stranded, or dead animal to make sure professional responders and scientists know about it and can take appropriate action. Males of this porpoise are larger and more robust than females. Dall’s porpoise are likely to mate by the end of each calving season: the animals have two calving seasons a year: one occurs from February to March, the other one lasts from July to August. This hump is more pronounced in males. Our work includes: Measuring the response of animals to sound using digital acoustic recording tags. Review the most recent stock assessment reports with population estimates. When stranded animals are found alive, NOAA Fisheries and our partners assess the animal’s health.  When stranded animals are found dead, our scientists work to understand and investigate the cause of death. Exceptions include nearer shore year-round populations in Japan, the Kamchatka Peninsula, Puget Sound, British Columbia, the Aleutians, and Alaska’s inside waters, such as the cooler, glacier fed waters of Kenai Fjords National Park. We regularly share information with the public about the status of Dall’s porpoises, as well as our research and efforts to maintain their populations. Habitat/Diet Dall's porpoises live throughout the North Pacific, along the North American coasts of California, Canada, and Alaska, and the Asian coasts of Japan, Korea, and Russia. Dall’s porpoises prefer temperate to boreal (northern, cold) waters that are more than 600 feet deep and with temperatures between 36°F and 63°F. The average life span is 16–17 years. The Dall’s Porpoise has a wide range in habitat. For the first 2 years of its life, the calf is nursed by its mother, while the father usually shows no parental care. - "Foraging behaviour and reproductive season habitat selection of northeast pacific porpoises" Our research projects have discovered new aspects of Dall’s porpoise biology, behavior, and ecology and help us better understand the challenges that all Dall’s porpoises face. As the mother carries her calf to the water's surface, she swims on her side, suckling the young. Although the cause often remains unknown, scientists can sometimes identify strandings due to disease, harmful algal blooms, vessel strikes, fishing gear entanglements, pollution exposure, and underwater noise. In 1873, this scientist was the first to collect specimen of this animal, today known as Dall's porpoise. Some strandings can serve as indicators of ocean health, giving insight into larger environmental issues that may also have implications for human health and welfare. Dall’s porpoises are limited to the North Pacific: in the east from California to the Bering Sea and Okhotsk Sea, and in the west down to the Sea of Japan. The killer whale and sharks (who have been known to attack Dall's Porpoise), fishing gear intended to catch fish, and human hunters who relish porpoise meat, are all enemies. NOAA Fisheries conducts various research activities on the biology, behavior, and ecology of the Dall’s porpoise. Dall’s porpoises usually swim at very high speed, doing zigzag movements just below the water surface and creating a wave of water known as a 'rooster tail', which is caused by the stream, moving off the animal's head and reaching the water surface. Description & Behavior. How do Dall’s porpoises have babies? Their flippers are small, round, and located near the front of the body. Unlike other porpoise species, Dall's porpoises are not at all shy and secretive: on the contrary, these animals can often be observed bow-riding and charging boats. In addition to a small dorsal fin, they have another small hump located just in front of their tail flukes. Newborn calves are approximately half the length of their mother and should immediately be taken to the water's surface in order to breath. The latter is small and triangular, and can angle forward. They are not threatened in the west coast range. The species i… Dall’s porpoises are found throughout the north Pacific Ocean, both in the open ocean and close to land where there is deep water. Usually swims in bands of 2 to 20. In fact, they look like a black and white blur as they shoot past.. Biologists conducted survey flights of the shifting sand shoals of the Copper River Delta to search…, Scientists at NOAA Fisheries’ Auke Bay Laboratories have mapped Dall’s porpoise distributions in Prince William Sound for the first time in nearly three decades. They eat squid, small crustaceans and many small fish, like herring and … Determining the number of Dall’s porpoises in each population—and whether a stock is increasing or decreasing over time—helps resource managers assess the success of enacted conservation measures. Through the development of our outreach and education programs, teachers, naturalists and scientists come together to educate the public on conservation issues that affect porpoises and their habitats: from ocean pollution to ocean noise, habitat … Our scientists collect information and present these data in annual stock assessment reports.Â, Find out more about what our scientists are learning about Dall's porpoises in Alaska. Learn more about our marine life viewing guidelines >. Dall's Porpoise on The IUCN Red List site -, https://en.wikipedia.org/wiki/Dall%27s_porpoise, http://www.iucnredlist.org/details/17032/0. The average adult is six feet in … We work with volunteer networks in all coastal states to respond to marine mammal strandings including large whales. Boaters and ferry passengers often see small groups of Dall’s porpoises in the Straits of Georgia and Juan de Fuca, as well as Johnstone and Queen Charlotte Straits off northeaster… This agile porpoise is one of the fastest cetaceans: when swimming, the animal leaves behind itself a "rooster tail" of water. The research was part of Gulf Watch Alaska, a program that monitors the long-term ecosystem…, This resource features passive acoustic sound clips of many amazing marine mammals that can be…, Entanglement in fishing gear, Feeding usually occurs at night when their prey migrates up toward the surface. Modern pollution controls have reduced but not eliminated many chemical contaminants, which continue to threaten Dall's porpoises. Markings and colorations vary by geographic location and life stage, with adults having more distinct colorations. NOAA Fisheries is committed to protecting Dall’s porpoises. These animals are often found bow riding on boats. Possibly the fastest of all dolphins and porpoises, Dall’s are notorious bow riders, darting back and forth in front of a moving ship, carving a rooster-tail spray as they surf the bow wave. Dall’s porpoise calves are born in mid-summer after a 12 month gestation period. Never approach or try to save an injured or entangled animal yourself—it can be dangerous to both the animal and you. Dall’s porpoises (Phocoenoides dalli) are only found in the North Pacific Ocean and adjacent seas (Bering, Okhotsk, and Japan/East seas).The species mainly inhabits deep, offshore, waters colder than 18°C. To understand the health of marine mammal populations, scientists study unusual mortality events. Dall’s porpoises are carnivores (piscivores and molluscivores). Increasing evidence suggests that exposure to intense underwater sound in some settings may cause some porpoises to strand and ultimately die. Hunting on various fish and cephalopods, Dall's porpoises control numbers of these prey species’ populations, thus serving as an important link in the food chain of their habitat. Dall's porpoises, Phocoenoides dalli, are cool water porpoises inhabiting the North Pacific Ocean and adjacent seas.The central Bering Sea marks the northern boundary of their range and, although they prefer colder water, Dall's porpoises are found in the warmer waters of Baja California on the east to southern Japan on the west. The baby porpoise is about three feet long at birth. There was another peak at 6500–7000 m … West Coast, NOAA Fisheries has issued an incidental harassment authorization (IHA) to the Lamont-Doherty Earth Observatory of Columbia University (L-DEO) to incidentally harass marine mammals during a marine geophysical survey in the Aleutian Islands, Alaska. Combining acoustic and visual detections increases sample size and allows for detections … Be responsible when viewing marine life in the wild. Their coloration is very dark gray or black with contrasting white markings on the dorsal fin and tail that distinguish Dall’s porpoises from other cetaceans. Males of this species are sexually mature at 5 - 8 years old, whereas females - earlier - by the age of 3 - 6 years. Japanese fisherman hunt Dall’s porpoises in the western North Pacific as a source of meat for human consumption, where approximately 18,000 Dall’s porpoises are taken annually. The mesmerizing cetacean known as the Dall’s Porpoise possesses a natural range that consists of the region of the North Pacific. The typical splash they create when swimming at high speeds is unique to them; it’s a fan-shaped splash famously … Females yield a single calf per year. Dall's porpoises have a relatively small, triangular head with little or no beak and a thick, robust body. Normally, they are not seen in mixed groups with other species, but in the northern part of their range, particularly, in the deep waters off Alaska and in Prince William Sound, Dall's porpoises can occasionally be observed with Harbor porpoises. As opposed to other porpoise species, Dall's porpoise lacks tubercles or bumps on the front edge of its dorsal fin. The teeth of these animals are spade-shaped as opposed to dolphin teeth, which are conical-shaped. Under the Marine Mammal Protection Act, an unusual mortality event (UME) is defined as "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response." Though they do occur coastally in some regions, Dall’s porpoise are primarily an oceanic species. Hybridization between Dall’s porpoise and harbour porpoise occurs occasionally in BC waters with harbour porpoise as the paternal parent and Dall’s porpoise as the maternal parent. Diet & Behaviour. Contaminants enter ocean waters and sediments from many sources—such as wastewater treatment plants, sewer outfalls, and pesticide application—and move through the food chain. Range & Habitat. All-black (melanistic) and all-white (albino) forms also exist but are considered rare. Dall’s Porpoise Expands Territory in a Changing Prince William Sound, Overseeing Marine Mammal Health and Stranding Response. The ideal habitat for Dall's porpoise is temperate to "boreal" waters with more than 600 feet (180 m) of depth and with temperatures, varying from 36°F (2°C) to 63°F (17°C). Dall’s porpoises, Phocoenoides dalli (True, 1885), are robust (particularly males) and muscular cetaceans with relatively small heads that slope steeply to short indistinct beaks. These porpoises are considered the fastest swimmers among small cetaceans, reaching speeds of 34 miles per hour over short distances. We compare habitat models for Dall's porpoise built with visual versus acoustic survey data from a linetransect survey in the Califomia Current and develop a combined model, utilizing both acoustic detections and visual sightings. … Additionally, some of these contaminants persist in the marine environment for decades and continue to threaten marine life. The tail stock and keel (where the caudal fin attaches to the body) are exaggerated and create a pronounced hump, which is large compared to other marine mammals. are also fairly common in the northeast Pacific but can also occur elsewhere. Often in mixed herds with the Pacific White-sided Dolphin. NOAA Fisheries is investigating all aspects of acoustic communication and hearing in marine animals. Range and Habitat The Dall’s porpoise is found only in the north Pacific Ocean, with its southernmost boundary being the waters off southern California. The tail of the Dall’s porpoise usually has a white strip. In southern British Columbia, Dall’s porpoises have been found to prefer coastal waters that range from 150-250m in depth. The triangular dorsal fin is positioned in the middle of the back, and often angles forward. Other variable and hybrid types (with harbor porpoises) are also relatively common. This occurs in fisheries targeting groundfish, salmon, and squid in Canadian, Russian, Japanese, Alaskan, and other U.S. waters. They are distributed across the central North Pacific, the eastern North Pacific (from the Mexico - U.S. border in the south to the Bering Sea in the north) and the western North Pacific (from central Japan to the Okhotsk Sea). NOAA Fisheries aims to increase public awareness and support for Dall’s porpoise conservation through education, outreach, and public participation. Each jaw of this animal holds 36 - 56 teeth that are very small and spade-shaped, allowing strong grasp. Many are year-round residents over much of their range. The initial IHA authorized take…, Stay informed of all the latest regional news around NOAA Fisheries. Migration patterns (inshore/offshore and north/south) are based on morphology/type, geography, and seasonality. Female Dall’s porpoises reproduce at approximately six years of age while male Dall’s porpoises mature at 8 years of age. The typical splash they create when swimming at high speeds is unique to them; it’s a fan-shaped splash famously … A special characteristic of Dall’s porpoises is their distinctive color pattern: a black body with a conspicuous white lateral patch on the left, right, and underside. North America, Asia. Dall’s porpoise is the largest of all porpoises. The species is named after the American naturalist W.H. In the northwest part of the Pacific, it can be found near Russia and Japan, including in the Bering and Okhotsk Seas and the Sea of Japan. Dall’s porpoise are not hard to find in Alaska waters. Underwater footage using GoPro HD Hero2 and a Snake River Prototyping Blur Fix housing. Photo: NOAA Fisheries/Kate Stafford. There are no reports of subsistence take of Dall’s porpoise in Alaska. They are often mistaken for baby killer whales, but unlike killer whales, their dorsal fins are triangle-shaped and they do not have eye patches or saddle patches. These cetaceans can live up to 22 years, but their lifespan is generally 15 to 20 years. Dall's porpoises become sexually mature at 3.5 to 8 years of age and give birth to a single calf after a gestation period of 10 to 12 months, usually between June and September. Like all marine mammals, the harbor porpoise is protected under the Marine Mammal Protection Act. Usually found in groups of 2-10, though oceanic populations can be found in larger numbers. In fact, they look like a black and white blur as they shoot past.. Dall's porpoises emit low-frequency clicks that are presumably used for echolocation. These commonly seen fun-loving playful porpoises can only be found in the North Pacific Ocean where they prefer cooler water temperatures between 36 and 60 degrees … Sightings of common dolphins and bottlenose dolphins have increased … Two distinct subspecies are currently recognized within the species based on distinguishable color patterns: P. d. truei and P. d. dalli. In addition, they have been seen in a company of Gray whales. This species is protected under the Marine Mammal Protection Act of 1972, as amended. Dall’s porpoises are likely the most common small cetaceans in the north Pacific. Hybrids between Dall's porpoises and harbor porpoises are also fairly common in the northeast Pacific but can also occur elsewhere. Figure A18.2 Harbour and Dalls porpoise high-density sightings (n50) from Study Area B (19951996, 19982008) with hot spots circled in grey. In addition, they use touch as well as a number of sounds, including clicks and whistles, as forms of communication. Dall the American zoologist who wrote about and sketched specimens taken off the coast of Alaska in 1873. Dall’s porpoises are polygynous animals. According to the IUCN Red List, the total population size of the Dall’s porpoise is over 1.2 million individuals, including: 83,400 individuals in Alaska; 35,000 to 134,000 individuals (averaging 86,000 individuals) along the U.S. west coast; 217,000 individuals in the western North Pacific; 226,000 individuals which migrate between the Sea of Japan and the southern Okhotsk Sea as well as 111,000 individuals in the northern Okhotsk Sea. They are known to associate with Pacific white-sided dolphins and short-finned pilot whales but have also been seen swimming alongside large whales. Dall's porpoises are common in the North Pacific Ocean and can be found off the U.S. West Coast from California to the Bering Sea in Alaska. Adults also have a chunkier and more robust body than juveniles. For management purposes, Dall's porpoises inhabiting U.S. waters have been divided into the Alaska stock and the California/Oregon/Washington stock.