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How Much Does An Adult Whale Weigh
Roger Payne, the scientist whose discovery that whales could read sparked an international environmental movement, has died.
Humpback Whale In The Ocean Off The Coast At Husavik In Iceland Stock Image
), also called the sulphurous whale, is the largest living animal, a type of baleen whale that can weigh up to 150 tons and reach a length of over 30 meters (98 feet). The largest blue whale accurately measured was a 29.5-meter female weighing 180 tons (about 200 short [US] tons), but there are reports of 33-meter fish that can reach 200 metric tons. The heart of a blue whale has been recorded at about 700 kilograms (about 1,500 pounds).
The blue whale is a cetacea and is scientifically classified within the order Cetacea as the gray whale (family Eschrichtiidae) and the rorqual (family Balaenopteridae), related to the right whales (Balaenidae and Neobalaenidae) of the subgroup Mysticeti.
Blue whales have a blue-gray color, with light gray spots in the form of large spots, as if they were painted with a large brush. The undersides of the fins are sometimes light gray or white. The blue whale is called the sulfur whale because the yellow underside of some individuals resembles the dark yellow color of that chemical element; this color is produced by certain algae (diatoms) that live in the whale’s body. The blue whale has a broad head, a small dorsal fin near its back, and 80 to 100 long fins running down its throat and chest. It has up to 800 short, wide, black baleen or “whale bones” in its mouth, which are thick, coarse bristles used to catch food. Females are generally larger than males, and the largest animals live in the Southern Ocean near Antarctica.
Blue whales are found singly or in small groups in all oceans, but populations in the Southern Hemisphere are the largest. In the Northern Hemisphere, blue whales can be seen regularly in the Gulf of St. Lawrence and the coast of Monterey, California, and Baja California, Mexico. They spend the summer in polar waters, eating shrimp-like crustaceans called krill. When diving, the blue whale can engage in a series of 360° turns and twists to find its prey, and can rapidly maneuver its body to sweep up large amounts of krill with a single blow of its open mouth. An adult blue can consume up to eight tons of krill per day. In winter, blue whales migrate to the Equator to breed. After about 12 months of gestation, the calf is born in an average of 8 meters (about 26 feet) of water. During lactation, calves gain up to 90 kg (about 198 lb) per day thanks to their mother’s rich milk. Babies are weaned at seven to eight months, at about 15 meters (about 49 feet) long.
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Once the most important of the commercially hunted baleen whales, the blue whale declined dramatically in the first half of the 20th century. In the 1930-31 season alone, the worldwide kill of blue whales exceeded 29,000. The species has been protected from commercial whaling since the mid-1960s. The blue whale population is recovering, and is estimated to be between 10,000 and 25,000 animals worldwide. However, the International Union for Conservation of Nature still lists blue whales as an endangered species. Unlike the toothed whale, the blue whale, whale or filter-feeding cetacean, is a temporary resident of the waters around the Channel Islands. Channel Islands National Marine Reserve and Park. It is the largest animal confirmed to exist in the world. With this species’ feeding grounds just off the coast of Southern California, the public is afforded the unique opportunity to view these amazing marine mammals on the whale watching boats that service the area.
Jefferson, T.A., S. Leatherwood, and M.A. Webber says, “The blue whale is the largest animal ever known; but it is about the same size as the fin whale and the sei whale. Like all other whales, the blue whale is slender and beautiful. The head is broad and shaped like U. when viewed from above (like a Gothic arch), and relatively straight when viewed from the side. The main hull has a prominent ridge in the center that ends in a “splashguard.” around the wind holes. The fins are long and pointed, while that of the stern the back is relatively small, distinctly shaped, and is about three-quarters of the way back from the tip of the snout. The broad beaks have a relatively straight back edge with a prominent ridge. The beak Blue whales are blue-grey on the back and below are slightly lighter. Their heads are the same blue color, but their backs and flanks are mottled. Viewed from above the water, they may appear mottled or light blue. Their bodies have broad spots. sides, back and belly, usually in a pattern of dark spots on a light surface, but sometimes vice versa. The chevron behind the horizontal holes sometimes marks the color transition between the head and the body. The throat has 55-88 long folds leading to or near the umbilicus. The mouth consists of 270-395 pairs of black, broad-based baleen plates, each less than 3 feet long. The strike is long and narrow, reaching a length of 30 feet or more.”
According to acoustic data, measurements and photo identification studies, there are two groups of blue whales in the North Pacific: eastern and western. The eastern group (west coast of the United States and Canada) spends the winter off Mexico and Central America and feeds in California and British Columbia in the summer/spring (June to November).
According to the Channel Islands National Marine Park, “Blue whales can be seen off the west coast of Baja California from about February to July. Peak numbers are reported there in April. They reappear in the area in October, but still They have not been seen. . They have been reported between November and January.” . They are common along the coast of Southern California from June to December. Sightings are common between July and October. Most blue whales migrate north beyond the Channel Islands. British Columbia’s coastal resorts peak in June and September. were reached, which suggested a northward movement across Vancouver Island in the spring and a southward shift in the fall.
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The environment of the blue whale, as reported in a 1998 study by the Southwest Fisheries Science Center (NOAA), shows this type of relationship and that its habitat interacts with the movement of food sources, as well as its migration. As shown in the study, the main feeding habitat appeared to be off the coast of San Miguel and Santa Rosa Islands in the Channel Islands and on the continental shelf close to the mainland. Also, large numbers of krill and other food sources for this species are generally found here.
Additional housing depends on the reproductive process. This species has been observed migrating to southern climates, from northern California to the Gulf of Cortez and south to Central America, providing better early feeding conditions for newborn calves. .However, the exact location of the areas where the mother blue whale activity takes place is still unknown.
Goldbogen (Scripps Institution of Oceanography) called the unique technique used by blue whales in feeding “lunge feeding”. which in turn allowed the blue whale to draw in and swallow a large collection of food. Once prey is caught, it is pushed out with its tongue, and animals such as krill are scooped up by the whale and remain as whale food.
The main diet of blue whales near the Channel Islands of California is krill, small shrimps that look like lobsters. Three types of krill make up this important food in the blue whale’s diet. They are North Pacific Krill (
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According to the Marine Mammal Center, “Females give birth to calves every two to three years. They are pregnant for about a year before giving birth. A blue whale calf is 23 feet long and weighs 5,000 to 6,000 pounds at birth. Blue of nursing Mother whales produce more than 50 gallons of milk per day. The milk contains 35-50% milk fat and allows the calf to gain weight.
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